use AddError everywhere (#2372)

internal/errchan/errchan.go

@@ -1,37 +0,0 @@
-package errchan
-
-import (
-	"fmt"
-	"strings"
-)
-
-type ErrChan struct {
-	C chan error
-}
-
-// New returns an error channel of max length 'n'
-// errors can be sent to the ErrChan.C channel, and will be returned when
-// ErrChan.Error() is called.
-func New(n int) *ErrChan {
-	return &ErrChan{
-		C: make(chan error, n),
-	}
-}
-
-// Error closes the ErrChan.C channel and returns an error if there are any
-// non-nil errors, otherwise returns nil.
-func (e *ErrChan) Error() error {
-	close(e.C)
-
-	var out string
-	for err := range e.C {
-		if err != nil {
-			out += "[" + err.Error() + "], "
-		}
-	}
-
-	if out != "" {
-		return fmt.Errorf("Errors encountered: " + strings.TrimRight(out, ", "))
-	}
-	return nil
-}

plugins/inputs/aerospike/aerospike.go

@@ -10,7 +10,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 
 	as "github.com/aerospike/aerospike-client-go"
@@ -41,17 +40,16 @@ func (a *Aerospike) Gather(acc telegraf.Accumulator) error {
 	}
 
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(a.Servers))
 	wg.Add(len(a.Servers))
 	for _, server := range a.Servers {
 		go func(serv string) {
 			defer wg.Done()
-			errChan.C <- a.gatherServer(serv, acc)
+			acc.AddError(a.gatherServer(serv, acc))
 		}(server)
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func (a *Aerospike) gatherServer(hostport string, acc telegraf.Accumulator) error {

plugins/inputs/aerospike/aerospike_test.go

@@ -19,7 +19,7 @@ func TestAerospikeStatistics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	assert.True(t, acc.HasMeasurement("aerospike_node"))
@@ -41,8 +41,7 @@ func TestAerospikeStatisticsPartialErr(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := a.Gather(&acc)
+	require.Error(t, acc.GatherError(a.Gather))
-	require.Error(t, err)
 
 	assert.True(t, acc.HasMeasurement("aerospike_node"))
 	assert.True(t, acc.HasMeasurement("aerospike_namespace"))

plugins/inputs/apache/apache.go

@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/influxdata/telegraf"
@@ -65,28 +66,23 @@ func (n *Apache) Gather(acc telegraf.Accumulator) error {
 		n.ResponseTimeout.Duration = time.Second * 5
 	}
 
-	var outerr error
+	var wg sync.WaitGroup
-	var errch = make(chan error)
+	wg.Add(len(n.Urls))
-
 	for _, u := range n.Urls {
 		addr, err := url.Parse(u)
 		if err != nil {
-			return fmt.Errorf("Unable to parse address '%s': %s", u, err)
+			acc.AddError(fmt.Errorf("Unable to parse address '%s': %s", u, err))
+			continue
 		}
 
 		go func(addr *url.URL) {
-			errch <- n.gatherUrl(addr, acc)
+			defer wg.Done()
+			acc.AddError(n.gatherUrl(addr, acc))
 		}(addr)
 	}
 
-	// Drain channel, waiting for all requests to finish and save last error.
+	wg.Wait()
-	for range n.Urls {
+	return nil
-		if err := <-errch; err != nil {
-			outerr = err
-		}
-	}
-
-	return outerr
 }
 
 func (n *Apache) gatherUrl(addr *url.URL, acc telegraf.Accumulator) error {

plugins/inputs/apache/apache_test.go

@@ -41,7 +41,7 @@ func TestHTTPApache(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{

plugins/inputs/cassandra/cassandra.go

@@ -7,7 +7,6 @@ import (
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 	"io/ioutil"
-	"log"
 	"net/http"
 	"net/url"
 	"strings"
@@ -123,8 +122,8 @@ func (j javaMetric) addTagsFields(out map[string]interface{}) {
 		}
 		j.acc.AddFields(tokens["class"]+tokens["type"], fields, tags)
 	} else {
-		fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
+		j.acc.AddError(fmt.Errorf("Missing key 'value' in '%s' output response\n%v\n",
-			j.metric, out)
+			j.metric, out))
 	}
 }
 
@@ -155,8 +154,8 @@ func (c cassandraMetric) addTagsFields(out map[string]interface{}) {
 				addCassandraMetric(k, c, v.(map[string]interface{}))
 			}
 		} else {
-			fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
+			c.acc.AddError(fmt.Errorf("Missing key 'value' in '%s' output response\n%v\n",
-				c.metric, out)
+				c.metric, out))
 			return
 		}
 	} else {
@@ -164,8 +163,8 @@ func (c cassandraMetric) addTagsFields(out map[string]interface{}) {
 			addCassandraMetric(r.(map[string]interface{})["mbean"].(string),
 				c, values.(map[string]interface{}))
 		} else {
-			fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
+			c.acc.AddError(fmt.Errorf("Missing key 'value' in '%s' output response\n%v\n",
-				c.metric, out)
+				c.metric, out))
 			return
 		}
 	}
@@ -274,8 +273,8 @@ func (c *Cassandra) Gather(acc telegraf.Accumulator) error {
 				m = newCassandraMetric(serverTokens["host"], metric, acc)
 			} else {
 				// unsupported metric type
-				log.Printf("I! Unsupported Cassandra metric [%s], skipping",
+				acc.AddError(fmt.Errorf("E! Unsupported Cassandra metric [%s], skipping",
-					metric)
+					metric))
 				continue
 			}
 
@@ -283,7 +282,8 @@ func (c *Cassandra) Gather(acc telegraf.Accumulator) error {
 			requestUrl, err := url.Parse("http://" + serverTokens["host"] + ":" +
 				serverTokens["port"] + context + metric)
 			if err != nil {
-				return err
+				acc.AddError(err)
+				continue
 			}
 			if serverTokens["user"] != "" && serverTokens["passwd"] != "" {
 				requestUrl.User = url.UserPassword(serverTokens["user"],
@@ -291,8 +291,12 @@ func (c *Cassandra) Gather(acc telegraf.Accumulator) error {
 			}
 
 			out, err := c.getAttr(requestUrl)
+			if err != nil {
+				acc.AddError(err)
+				continue
+			}
 			if out["status"] != 200.0 {
-				fmt.Printf("URL returned with status %v\n", out["status"])
+				acc.AddError(fmt.Errorf("URL returned with status %v\n", out["status"]))
 				continue
 			}
 			m.addTagsFields(out)

plugins/inputs/cassandra/cassandra_test.go

@@ -151,7 +151,7 @@ func TestHttpJsonJavaMultiValue(t *testing.T) {
 
 	var acc testutil.Accumulator
 	acc.SetDebug(true)
-	err := cassandra.Gather(&acc)
+	err := acc.GatherError(cassandra.Gather)
 
 	assert.Nil(t, err)
 	assert.Equal(t, 2, len(acc.Metrics))
@@ -180,7 +180,7 @@ func TestHttpJsonJavaMultiType(t *testing.T) {
 
 	var acc testutil.Accumulator
 	acc.SetDebug(true)
-	err := cassandra.Gather(&acc)
+	err := acc.GatherError(cassandra.Gather)
 
 	assert.Nil(t, err)
 	assert.Equal(t, 2, len(acc.Metrics))
@@ -197,16 +197,17 @@ func TestHttpJsonJavaMultiType(t *testing.T) {
 }
 
 // Test that the proper values are ignored or collected
-func TestHttpJsonOn404(t *testing.T) {
+func TestHttp404(t *testing.T) {
 
-	jolokia := genJolokiaClientStub(validJavaMultiValueJSON, 404, Servers,
+	jolokia := genJolokiaClientStub(invalidJSON, 404, Servers,
 		[]string{HeapMetric})
 
 	var acc testutil.Accumulator
-	err := jolokia.Gather(&acc)
+	err := acc.GatherError(jolokia.Gather)
 
-	assert.Nil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, len(acc.Metrics))
+	assert.Contains(t, err.Error(), "has status code 404")
 }
 
 // Test that the proper values are ignored or collected for class=Cassandra
@@ -214,7 +215,7 @@ func TestHttpJsonCassandraMultiValue(t *testing.T) {
 	cassandra := genJolokiaClientStub(validCassandraMultiValueJSON, 200, Servers, []string{ReadLatencyMetric})
 
 	var acc testutil.Accumulator
-	err := cassandra.Gather(&acc)
+	err := acc.GatherError(cassandra.Gather)
 
 	assert.Nil(t, err)
 	assert.Equal(t, 1, len(acc.Metrics))
@@ -246,7 +247,7 @@ func TestHttpJsonCassandraNestedMultiValue(t *testing.T) {
 
 	var acc testutil.Accumulator
 	acc.SetDebug(true)
-	err := cassandra.Gather(&acc)
+	err := acc.GatherError(cassandra.Gather)
 
 	assert.Nil(t, err)
 	assert.Equal(t, 2, len(acc.Metrics))

plugins/inputs/ceph/ceph.go

@@ -101,12 +101,12 @@ func (c *Ceph) gatherAdminSocketStats(acc telegraf.Accumulator) error {
 	for _, s := range sockets {
 		dump, err := perfDump(c.CephBinary, s)
 		if err != nil {
-			log.Printf("E! error reading from socket '%s': %v", s.socket, err)
+			acc.AddError(fmt.Errorf("E! error reading from socket '%s': %v", s.socket, err))
 			continue
 		}
 		data, err := parseDump(dump)
 		if err != nil {
-			log.Printf("E! error parsing dump from socket '%s': %v", s.socket, err)
+			acc.AddError(fmt.Errorf("E! error parsing dump from socket '%s': %v", s.socket, err))
 			continue
 		}
 		for tag, metrics := range data {

plugins/inputs/cgroup/cgroup_linux.go

@@ -22,10 +22,11 @@ func (g *CGroup) Gather(acc telegraf.Accumulator) error {
 
 	for dir := range list {
 		if dir.err != nil {
-			return dir.err
+			acc.AddError(dir.err)
+			continue
 		}
 		if err := g.gatherDir(dir.path, acc); err != nil {
-			return err
+			acc.AddError(err)
 		}
 	}
 

plugins/inputs/cgroup/cgroup_test.go

@@ -24,7 +24,7 @@ var cg1 = &CGroup{
 func TestCgroupStatistics_1(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := cg1.Gather(&acc)
+	err := acc.GatherError(cg1.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -56,7 +56,7 @@ var cg2 = &CGroup{
 func TestCgroupStatistics_2(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := cg2.Gather(&acc)
+	err := acc.GatherError(cg2.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -81,7 +81,7 @@ var cg3 = &CGroup{
 func TestCgroupStatistics_3(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := cg3.Gather(&acc)
+	err := acc.GatherError(cg3.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -108,7 +108,7 @@ var cg4 = &CGroup{
 func TestCgroupStatistics_4(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := cg4.Gather(&acc)
+	err := acc.GatherError(cg4.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -140,7 +140,7 @@ var cg5 = &CGroup{
 func TestCgroupStatistics_5(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := cg5.Gather(&acc)
+	err := acc.GatherError(cg5.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -167,7 +167,7 @@ var cg6 = &CGroup{
 func TestCgroupStatistics_6(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := cg6.Gather(&acc)
+	err := acc.GatherError(cg6.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{

plugins/inputs/cloudwatch/cloudwatch.go

@@ -13,7 +13,6 @@ import (
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
 	internalaws "github.com/influxdata/telegraf/internal/config/aws"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/internal/limiter"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
@@ -186,8 +185,6 @@ func (c *CloudWatch) Gather(acc telegraf.Accumulator) error {
 	if err != nil {
 		return err
 	}
-	metricCount := len(metrics)
-	errChan := errchan.New(metricCount)
 
 	now := time.Now()
 
@@ -202,12 +199,12 @@ func (c *CloudWatch) Gather(acc telegraf.Accumulator) error {
 		<-lmtr.C
 		go func(inm *cloudwatch.Metric) {
 			defer wg.Done()
-			c.gatherMetric(acc, inm, now, errChan.C)
+			acc.AddError(c.gatherMetric(acc, inm, now))
 		}(m)
 	}
 	wg.Wait()
 
-	return errChan.Error()
+	return nil
 }
 
 func init() {
@@ -285,13 +282,11 @@ func (c *CloudWatch) gatherMetric(
 	acc telegraf.Accumulator,
 	metric *cloudwatch.Metric,
 	now time.Time,
-	errChan chan error,
+) error {
-) {
 	params := c.getStatisticsInput(metric, now)
 	resp, err := c.client.GetMetricStatistics(params)
 	if err != nil {
-		errChan <- err
+		return err
-		return
 	}
 
 	for _, point := range resp.Datapoints {
@@ -326,7 +321,7 @@ func (c *CloudWatch) gatherMetric(
 		acc.AddFields(formatMeasurement(c.Namespace), fields, tags, *point.Timestamp)
 	}
 
-	errChan <- nil
+	return nil
 }
 
 /*

plugins/inputs/cloudwatch/cloudwatch_test.go

@@ -64,7 +64,7 @@ func TestGather(t *testing.T) {
 	var acc testutil.Accumulator
 	c.client = &mockGatherCloudWatchClient{}
 
-	c.Gather(&acc)
+	acc.GatherError(c.Gather)
 
 	fields := map[string]interface{}{}
 	fields["latency_minimum"] = 0.1

plugins/inputs/conntrack/conntrack.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
-	"log"
 	"path/filepath"
 )
 
@@ -93,15 +92,15 @@ func (c *Conntrack) Gather(acc telegraf.Accumulator) error {
 
 			contents, err := ioutil.ReadFile(fName)
 			if err != nil {
-				log.Printf("E! failed to read file '%s': %v", fName, err)
+				acc.AddError(fmt.Errorf("E! failed to read file '%s': %v", fName, err))
 				continue
 			}
 
 			v := strings.TrimSpace(string(contents))
 			fields[metricKey], err = strconv.ParseFloat(v, 64)
 			if err != nil {
-				log.Printf("E! failed to parse metric, expected number but "+
+				acc.AddError(fmt.Errorf("E! failed to parse metric, expected number but "+
-					" found '%s': %v", v, err)
+					" found '%s': %v", v, err))
 			}
 		}
 	}

plugins/inputs/couchbase/couchbase.go

@@ -42,19 +42,17 @@ func (r *Couchbase) Gather(acc telegraf.Accumulator) error {
 
 	var wg sync.WaitGroup
 
-	var outerr error
-
 	for _, serv := range r.Servers {
 		wg.Add(1)
 		go func(serv string) {
 			defer wg.Done()
-			outerr = r.gatherServer(serv, acc, nil)
+			acc.AddError(r.gatherServer(serv, acc, nil))
 		}(serv)
 	}
 
 	wg.Wait()
 
-	return outerr
+	return nil
 }
 
 func (r *Couchbase) gatherServer(addr string, acc telegraf.Accumulator, pool *couchbase.Pool) error {

plugins/inputs/couchdb/couchdb.go

@@ -2,13 +2,11 @@ package couchdb
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 	"net/http"
 	"reflect"
-	"strings"
 	"sync"
 	"time"
 )
@@ -83,34 +81,20 @@ func (*CouchDB) SampleConfig() string {
 }
 
 func (c *CouchDB) Gather(accumulator telegraf.Accumulator) error {
-	errorChannel := make(chan error, len(c.HOSTs))
 	var wg sync.WaitGroup
 	for _, u := range c.HOSTs {
 		wg.Add(1)
 		go func(host string) {
 			defer wg.Done()
 			if err := c.fetchAndInsertData(accumulator, host); err != nil {
-				errorChannel <- fmt.Errorf("[host=%s]: %s", host, err)
+				accumulator.AddError(fmt.Errorf("[host=%s]: %s", host, err))
 			}
 		}(u)
 	}
 
 	wg.Wait()
-	close(errorChannel)
-
-	// If there weren't any errors, we can return nil now.
-	if len(errorChannel) == 0 {
-		return nil
-	}
-
-	// There were errors, so join them all together as one big error.
-	errorStrings := make([]string, 0, len(errorChannel))
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
-
-	return errors.New(strings.Join(errorStrings, "\n"))
 
+	return nil
 }
 
 var tr = &http.Transport{

plugins/inputs/couchdb/couchdb_test.go

@@ -316,5 +316,5 @@ func TestBasic(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	require.NoError(t, plugin.Gather(&acc))
+	require.NoError(t, acc.GatherError(plugin.Gather))
 }

plugins/inputs/disque/disque.go

@@ -75,12 +75,11 @@ func (g *Disque) Gather(acc telegraf.Accumulator) error {
 
 	var wg sync.WaitGroup
 
-	var outerr error
-
 	for _, serv := range g.Servers {
 		u, err := url.Parse(serv)
 		if err != nil {
-			return fmt.Errorf("Unable to parse to address '%s': %s", serv, err)
+			acc.AddError(fmt.Errorf("Unable to parse to address '%s': %s", serv, err))
+			continue
 		} else if u.Scheme == "" {
 			// fallback to simple string based address (i.e. "10.0.0.1:10000")
 			u.Scheme = "tcp"
@@ -90,13 +89,13 @@ func (g *Disque) Gather(acc telegraf.Accumulator) error {
 		wg.Add(1)
 		go func(serv string) {
 			defer wg.Done()
-			outerr = g.gatherServer(u, acc)
+			acc.AddError(g.gatherServer(u, acc))
 		}(serv)
 	}
 
 	wg.Wait()
 
-	return outerr
+	return nil
 }
 
 const defaultPort = "7711"

plugins/inputs/disque/disque_test.go

@@ -51,7 +51,7 @@ func TestDisqueGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err = r.Gather(&acc)
+	err = acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{
@@ -117,7 +117,7 @@ func TestDisqueCanPullStatsFromMultipleServers(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err = r.Gather(&acc)
+	err = acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{

plugins/inputs/dns_query/dns_query.go

@@ -9,7 +9,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -58,11 +57,10 @@ func (d *DnsQuery) Description() string {
 func (d *DnsQuery) Gather(acc telegraf.Accumulator) error {
 	d.setDefaultValues()
 
-	errChan := errchan.New(len(d.Domains) * len(d.Servers))
 	for _, domain := range d.Domains {
 		for _, server := range d.Servers {
 			dnsQueryTime, err := d.getDnsQueryTime(domain, server)
-			errChan.C <- err
+			acc.AddError(err)
 			tags := map[string]string{
 				"server":      server,
 				"domain":      domain,
@@ -74,7 +72,7 @@ func (d *DnsQuery) Gather(acc telegraf.Accumulator) error {
 		}
 	}
 
-	return errChan.Error()
+	return nil
 }
 
 func (d *DnsQuery) setDefaultValues() {

plugins/inputs/dns_query/dns_query_test.go

@@ -24,7 +24,7 @@ func TestGathering(t *testing.T) {
 	}
 	var acc testutil.Accumulator
 
-	err := dnsConfig.Gather(&acc)
+	err := acc.GatherError(dnsConfig.Gather)
 	assert.NoError(t, err)
 	metric, ok := acc.Get("dns_query")
 	require.True(t, ok)
@@ -44,7 +44,7 @@ func TestGatheringMxRecord(t *testing.T) {
 	var acc testutil.Accumulator
 	dnsConfig.RecordType = "MX"
 
-	err := dnsConfig.Gather(&acc)
+	err := acc.GatherError(dnsConfig.Gather)
 	assert.NoError(t, err)
 	metric, ok := acc.Get("dns_query")
 	require.True(t, ok)
@@ -70,7 +70,7 @@ func TestGatheringRootDomain(t *testing.T) {
 	}
 	fields := map[string]interface{}{}
 
-	err := dnsConfig.Gather(&acc)
+	err := acc.GatherError(dnsConfig.Gather)
 	assert.NoError(t, err)
 	metric, ok := acc.Get("dns_query")
 	require.True(t, ok)
@@ -96,7 +96,7 @@ func TestMetricContainsServerAndDomainAndRecordTypeTags(t *testing.T) {
 	}
 	fields := map[string]interface{}{}
 
-	err := dnsConfig.Gather(&acc)
+	err := acc.GatherError(dnsConfig.Gather)
 	assert.NoError(t, err)
 	metric, ok := acc.Get("dns_query")
 	require.True(t, ok)
@@ -121,7 +121,7 @@ func TestGatheringTimeout(t *testing.T) {
 
 	channel := make(chan error, 1)
 	go func() {
-		channel <- dnsConfig.Gather(&acc)
+		channel <- acc.GatherError(dnsConfig.Gather)
 	}()
 	select {
 	case res := <-channel:

plugins/inputs/docker/docker.go

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"log"
 	"regexp"
 	"strconv"
 	"strings"
@@ -159,7 +158,7 @@ func (d *Docker) Gather(acc telegraf.Accumulator) error {
 	// Get daemon info
 	err := d.gatherInfo(acc)
 	if err != nil {
-		fmt.Println(err.Error())
+		acc.AddError(err)
 	}
 
 	// List containers
@@ -179,8 +178,8 @@ func (d *Docker) Gather(acc telegraf.Accumulator) error {
 			defer wg.Done()
 			err := d.gatherContainer(c, acc)
 			if err != nil {
-				log.Printf("E! Error gathering container %s stats: %s\n",
+				acc.AddError(fmt.Errorf("E! Error gathering container %s stats: %s\n",
-					c.Names, err.Error())
+					c.Names, err.Error()))
 			}
 		}(container)
 	}

plugins/inputs/docker/docker_test.go

@@ -302,7 +302,7 @@ func TestDockerGatherInfo(t *testing.T) {
 		testing: true,
 	}
 
-	err := d.Gather(&acc)
+	err := acc.GatherError(d.Gather)
 	require.NoError(t, err)
 
 	acc.AssertContainsTaggedFields(t,

plugins/inputs/dovecot/dovecot.go

@@ -12,7 +12,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -66,19 +65,18 @@ func (d *Dovecot) Gather(acc telegraf.Accumulator) error {
 	}
 
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(d.Servers) * len(d.Filters))
 	for _, server := range d.Servers {
 		for _, filter := range d.Filters {
 			wg.Add(1)
 			go func(s string, f string) {
 				defer wg.Done()
-				errChan.C <- d.gatherServer(s, acc, d.Type, f)
+				acc.AddError(d.gatherServer(s, acc, d.Type, f))
 			}(server, filter)
 		}
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func (d *Dovecot) gatherServer(addr string, acc telegraf.Accumulator, qtype string, filter string) error {

plugins/inputs/elasticsearch/elasticsearch.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 	jsonparser "github.com/influxdata/telegraf/plugins/parsers/json"
 	"io/ioutil"
@@ -153,7 +152,6 @@ func (e *Elasticsearch) Gather(acc telegraf.Accumulator) error {
 		e.client = client
 	}
 
-	errChan := errchan.New(len(e.Servers) * 3)
 	var wg sync.WaitGroup
 	wg.Add(len(e.Servers))
 
@@ -176,24 +174,21 @@ func (e *Elasticsearch) Gather(acc telegraf.Accumulator) error {
 
 			// Always gather node states
 			if err := e.gatherNodeStats(url, acc); err != nil {
-				err = fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))
+				acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@")))
-				errChan.C <- err
 				return
 			}
 
 			if e.ClusterHealth {
 				url = s + "/_cluster/health?level=indices"
 				if err := e.gatherClusterHealth(url, acc); err != nil {
-					err = fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))
+					acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@")))
-					errChan.C <- err
 					return
 				}
 			}
 
 			if e.ClusterStats && e.isMaster {
 				if err := e.gatherClusterStats(s+"/_cluster/stats", acc); err != nil {
-					err = fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))
+					acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@")))
-					errChan.C <- err
 					return
 				}
 			}
@@ -201,7 +196,7 @@ func (e *Elasticsearch) Gather(acc telegraf.Accumulator) error {
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func (e *Elasticsearch) createHttpClient() (*http.Client, error) {

plugins/inputs/elasticsearch/elasticsearch_test.go

@@ -71,7 +71,7 @@ func TestGather(t *testing.T) {
 	es.client.Transport = newTransportMock(http.StatusOK, nodeStatsResponse)
 
 	var acc testutil.Accumulator
-	if err := es.Gather(&acc); err != nil {
+	if err := acc.GatherError(es.Gather); err != nil {
 		t.Fatal(err)
 	}
 

plugins/inputs/exec/exec.go

@@ -15,7 +15,6 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 	"github.com/influxdata/telegraf/plugins/parsers"
 	"github.com/influxdata/telegraf/plugins/parsers/nagios"
@@ -49,8 +48,7 @@ type Exec struct {
 
 	parser parsers.Parser
 
-	runner  Runner
+	runner Runner
-	errChan chan error
 }
 
 func NewExec() *Exec {
@@ -150,13 +148,13 @@ func (e *Exec) ProcessCommand(command string, acc telegraf.Accumulator, wg *sync
 
 	out, err := e.runner.Run(e, command, acc)
 	if err != nil {
-		e.errChan <- err
+		acc.AddError(err)
 		return
 	}
 
 	metrics, err := e.parser.Parse(out)
 	if err != nil {
-		e.errChan <- err
+		acc.AddError(err)
 	} else {
 		for _, metric := range metrics {
 			acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
@@ -193,7 +191,8 @@ func (e *Exec) Gather(acc telegraf.Accumulator) error {
 
 		matches, err := filepath.Glob(cmdAndArgs[0])
 		if err != nil {
-			return err
+			acc.AddError(err)
+			continue
 		}
 
 		if len(matches) == 0 {
@@ -214,15 +213,12 @@ func (e *Exec) Gather(acc telegraf.Accumulator) error {
 		}
 	}
 
-	errChan := errchan.New(len(commands))
-	e.errChan = errChan.C
-
 	wg.Add(len(commands))
 	for _, command := range commands {
 		go e.ProcessCommand(command, acc, &wg)
 	}
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func init() {

plugins/inputs/exec/exec_test.go

@@ -101,7 +101,7 @@ func TestExec(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	err := acc.GatherError(e.Gather)
 	require.NoError(t, err)
 	assert.Equal(t, acc.NFields(), 8, "non-numeric measurements should be ignored")
 
@@ -127,8 +127,7 @@ func TestExecMalformed(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	require.Error(t, acc.GatherError(e.Gather))
-	require.Error(t, err)
 	assert.Equal(t, acc.NFields(), 0, "No new points should have been added")
 }
 
@@ -141,8 +140,7 @@ func TestCommandError(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	require.Error(t, acc.GatherError(e.Gather))
-	require.Error(t, err)
 	assert.Equal(t, acc.NFields(), 0, "No new points should have been added")
 }
 
@@ -155,8 +153,7 @@ func TestLineProtocolParse(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	require.NoError(t, acc.GatherError(e.Gather))
-	require.NoError(t, err)
 
 	fields := map[string]interface{}{
 		"usage_idle": float64(99),
@@ -191,7 +188,7 @@ func TestLineProtocolShortParse(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	err := acc.GatherError(e.Gather)
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "buffer too short", "A buffer too short error was expected")
 }
@@ -205,7 +202,7 @@ func TestLineProtocolParseMultiple(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	err := acc.GatherError(e.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{
@@ -231,7 +228,7 @@ func TestExecCommandWithGlob(t *testing.T) {
 	e.SetParser(parser)
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	err := acc.GatherError(e.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{
@@ -247,7 +244,7 @@ func TestExecCommandWithoutGlob(t *testing.T) {
 	e.SetParser(parser)
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	err := acc.GatherError(e.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{
@@ -263,7 +260,7 @@ func TestExecCommandWithoutGlobAndPath(t *testing.T) {
 	e.SetParser(parser)
 
 	var acc testutil.Accumulator
-	err := e.Gather(&acc)
+	err := acc.GatherError(e.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{

plugins/inputs/filestat/filestat.go

@@ -48,7 +48,6 @@ func (_ *FileStat) Description() string {
 func (_ *FileStat) SampleConfig() string { return sampleConfig }
 
 func (f *FileStat) Gather(acc telegraf.Accumulator) error {
-	var errS string
 	var err error
 
 	for _, filepath := range f.Files {
@@ -56,7 +55,7 @@ func (f *FileStat) Gather(acc telegraf.Accumulator) error {
 		g, ok := f.globs[filepath]
 		if !ok {
 			if g, err = globpath.Compile(filepath); err != nil {
-				errS += err.Error() + " "
+				acc.AddError(err)
 				continue
 			}
 			f.globs[filepath] = g
@@ -92,7 +91,7 @@ func (f *FileStat) Gather(acc telegraf.Accumulator) error {
 			if f.Md5 {
 				md5, err := getMd5(fileName)
 				if err != nil {
-					errS += err.Error() + " "
+					acc.AddError(err)
 				} else {
 					fields["md5_sum"] = md5
 				}
@@ -102,9 +101,6 @@ func (f *FileStat) Gather(acc telegraf.Accumulator) error {
 		}
 	}
 
-	if errS != "" {
-		return fmt.Errorf(errS)
-	}
 	return nil
 }
 

plugins/inputs/filestat/filestat_test.go

@@ -19,7 +19,7 @@ func TestGatherNoMd5(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	fs.Gather(&acc)
+	acc.GatherError(fs.Gather)
 
 	tags1 := map[string]string{
 		"file": dir + "log1.log",
@@ -59,7 +59,7 @@ func TestGatherExplicitFiles(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	fs.Gather(&acc)
+	acc.GatherError(fs.Gather)
 
 	tags1 := map[string]string{
 		"file": dir + "log1.log",
@@ -99,7 +99,7 @@ func TestGatherGlob(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	fs.Gather(&acc)
+	acc.GatherError(fs.Gather)
 
 	tags1 := map[string]string{
 		"file": dir + "log1.log",
@@ -131,7 +131,7 @@ func TestGatherSuperAsterisk(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	fs.Gather(&acc)
+	acc.GatherError(fs.Gather)
 
 	tags1 := map[string]string{
 		"file": dir + "log1.log",

plugins/inputs/graylog/graylog.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"encoding/base64"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net"
@@ -149,31 +148,17 @@ func (h *GrayLog) Gather(acc telegraf.Accumulator) error {
 		h.client.SetHTTPClient(client)
 	}
 
-	errorChannel := make(chan error, len(h.Servers))
-
 	for _, server := range h.Servers {
 		wg.Add(1)
 		go func(server string) {
 			defer wg.Done()
-			if err := h.gatherServer(acc, server); err != nil {
+			acc.AddError(h.gatherServer(acc, server))
-				errorChannel <- err
-			}
 		}(server)
 	}
 
 	wg.Wait()
-	close(errorChannel)
 
-	// Get all errors and return them as one giant error
+	return nil
-	errorStrings := []string{}
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
-
-	if len(errorStrings) == 0 {
-		return nil
-	}
-	return errors.New(strings.Join(errorStrings, "\n"))
 }
 
 // Gathers data from a particular server

plugins/inputs/graylog/graylog_test.go

@@ -157,7 +157,7 @@ func TestNormalResponse(t *testing.T) {
 
 	for _, service := range graylog {
 		var acc testutil.Accumulator
-		err := service.Gather(&acc)
+		err := acc.GatherError(service.Gather)
 		require.NoError(t, err)
 		for k, v := range expectedFields {
 			acc.AssertContainsTaggedFields(t, k, v, validTags[k])
@@ -170,9 +170,9 @@ func TestHttpJson500(t *testing.T) {
 	graylog := genMockGrayLog(validJSON, 500)
 
 	var acc testutil.Accumulator
-	err := graylog[0].Gather(&acc)
+	err := acc.GatherError(graylog[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -181,9 +181,9 @@ func TestHttpJsonBadJson(t *testing.T) {
 	graylog := genMockGrayLog(invalidJSON, 200)
 
 	var acc testutil.Accumulator
-	err := graylog[0].Gather(&acc)
+	err := acc.GatherError(graylog[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -192,8 +192,8 @@ func TestHttpJsonEmptyResponse(t *testing.T) {
 	graylog := genMockGrayLog(empty, 200)
 
 	var acc testutil.Accumulator
-	err := graylog[0].Gather(&acc)
+	err := acc.GatherError(graylog[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }

plugins/inputs/httpjson/httpjson.go

@@ -1,7 +1,6 @@
 package httpjson
 
 import (
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -145,31 +144,17 @@ func (h *HttpJson) Gather(acc telegraf.Accumulator) error {
 		h.client.SetHTTPClient(client)
 	}
 
-	errorChannel := make(chan error, len(h.Servers))
-
 	for _, server := range h.Servers {
 		wg.Add(1)
 		go func(server string) {
 			defer wg.Done()
-			if err := h.gatherServer(acc, server); err != nil {
+			acc.AddError(h.gatherServer(acc, server))
-				errorChannel <- err
-			}
 		}(server)
 	}
 
 	wg.Wait()
-	close(errorChannel)
 
-	// Get all errors and return them as one giant error
+	return nil
-	errorStrings := []string{}
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
-
-	if len(errorStrings) == 0 {
-		return nil
-	}
-	return errors.New(strings.Join(errorStrings, "\n"))
 }
 
 // Gathers data from a particular server

plugins/inputs/httpjson/httpjson_test.go

@@ -210,7 +210,7 @@ func TestHttpJson200(t *testing.T) {
 
 	for _, service := range httpjson {
 		var acc testutil.Accumulator
-		err := service.Gather(&acc)
+		err := acc.GatherError(service.Gather)
 		require.NoError(t, err)
 		assert.Equal(t, 12, acc.NFields())
 		// Set responsetime
@@ -245,7 +245,7 @@ func TestHttpJsonGET_URL(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	// remove response_time from gathered fields because it's non-deterministic
@@ -318,7 +318,7 @@ func TestHttpJsonGET(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	// remove response_time from gathered fields because it's non-deterministic
@@ -392,7 +392,7 @@ func TestHttpJsonPOST(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := a.Gather(&acc)
+	err := acc.GatherError(a.Gather)
 	require.NoError(t, err)
 
 	// remove response_time from gathered fields because it's non-deterministic
@@ -448,9 +448,9 @@ func TestHttpJson500(t *testing.T) {
 	httpjson := genMockHttpJson(validJSON, 500)
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -460,9 +460,9 @@ func TestHttpJsonBadMethod(t *testing.T) {
 	httpjson[0].Method = "NOT_A_REAL_METHOD"
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -471,9 +471,9 @@ func TestHttpJsonBadJson(t *testing.T) {
 	httpjson := genMockHttpJson(invalidJSON, 200)
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -482,9 +482,9 @@ func TestHttpJsonEmptyResponse(t *testing.T) {
 	httpjson := genMockHttpJson(empty, 200)
 
 	var acc testutil.Accumulator
-	err := httpjson[0].Gather(&acc)
+	err := acc.GatherError(httpjson[0].Gather)
 
-	assert.NotNil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, acc.NFields())
 }
 
@@ -495,7 +495,7 @@ func TestHttpJson200Tags(t *testing.T) {
 	for _, service := range httpjson {
 		if service.Name == "other_webapp" {
 			var acc testutil.Accumulator
-			err := service.Gather(&acc)
+			err := acc.GatherError(service.Gather)
 			// Set responsetime
 			for _, p := range acc.Metrics {
 				p.Fields["response_time"] = 1.0
@@ -533,7 +533,7 @@ func TestHttpJsonArray200Tags(t *testing.T) {
 	for _, service := range httpjson {
 		if service.Name == "other_webapp" {
 			var acc testutil.Accumulator
-			err := service.Gather(&acc)
+			err := acc.GatherError(service.Gather)
 			// Set responsetime
 			for _, p := range acc.Metrics {
 				p.Fields["response_time"] = 1.0

plugins/inputs/influxdb/influxdb.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
-	"strings"
 	"sync"
 	"time"
 
@@ -57,34 +56,20 @@ func (i *InfluxDB) Gather(acc telegraf.Accumulator) error {
 		}
 	}
 
-	errorChannel := make(chan error, len(i.URLs))
-
 	var wg sync.WaitGroup
 	for _, u := range i.URLs {
 		wg.Add(1)
 		go func(url string) {
 			defer wg.Done()
 			if err := i.gatherURL(acc, url); err != nil {
-				errorChannel <- fmt.Errorf("[url=%s]: %s", url, err)
+				acc.AddError(fmt.Errorf("[url=%s]: %s", url, err))
 			}
 		}(u)
 	}
 
 	wg.Wait()
-	close(errorChannel)
 
-	// If there weren't any errors, we can return nil now.
+	return nil
-	if len(errorChannel) == 0 {
-		return nil
-	}
-
-	// There were errors, so join them all together as one big error.
-	errorStrings := make([]string, 0, len(errorChannel))
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
-
-	return errors.New(strings.Join(errorStrings, "\n"))
 }
 
 type point struct {

plugins/inputs/influxdb/influxdb_test.go

@@ -25,7 +25,7 @@ func TestBasic(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	require.NoError(t, plugin.Gather(&acc))
+	require.NoError(t, acc.GatherError(plugin.Gather))
 
 	require.Len(t, acc.Metrics, 3)
 	fields := map[string]interface{}{
@@ -72,7 +72,7 @@ func TestInfluxDB(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	require.NoError(t, plugin.Gather(&acc))
+	require.NoError(t, acc.GatherError(plugin.Gather))
 
 	require.Len(t, acc.Metrics, 34)
 
@@ -132,7 +132,7 @@ func TestInfluxDB2(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	require.NoError(t, plugin.Gather(&acc))
+	require.NoError(t, acc.GatherError(plugin.Gather))
 
 	require.Len(t, acc.Metrics, 34)
 
@@ -157,7 +157,7 @@ func TestErrorHandling(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	require.Error(t, plugin.Gather(&acc))
+	require.Error(t, acc.GatherError(plugin.Gather))
 }
 
 func TestErrorHandling404(t *testing.T) {
@@ -175,7 +175,7 @@ func TestErrorHandling404(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	require.Error(t, plugin.Gather(&acc))
+	require.Error(t, acc.GatherError(plugin.Gather))
 }
 
 const basicJSON = `

plugins/inputs/ipmi_sensor/ipmi.go

@@ -52,7 +52,8 @@ func (m *Ipmi) Gather(acc telegraf.Accumulator) error {
 		for _, server := range m.Servers {
 			err := m.parse(acc, server)
 			if err != nil {
-				return err
+				acc.AddError(err)
+				continue
 			}
 		}
 	} else {

plugins/inputs/ipmi_sensor/ipmi_test.go

@@ -20,7 +20,7 @@ func TestGather(t *testing.T) {
 	execCommand = fakeExecCommand
 	var acc testutil.Accumulator
 
-	err := i.Gather(&acc)
+	err := acc.GatherError(i.Gather)
 
 	require.NoError(t, err)
 
@@ -121,7 +121,7 @@ func TestGather(t *testing.T) {
 		Path: "ipmitool",
 	}
 
-	err = i.Gather(&acc)
+	err = acc.GatherError(i.Gather)
 
 	var testsWithoutServer = []struct {
 		fields map[string]interface{}

plugins/inputs/iptables/iptables.go

@@ -54,20 +54,19 @@ func (ipt *Iptables) Gather(acc telegraf.Accumulator) error {
 	}
 	// best effort : we continue through the chains even if an error is encountered,
 	// but we keep track of the last error.
-	var err error
 	for _, chain := range ipt.Chains {
 		data, e := ipt.lister(ipt.Table, chain)
 		if e != nil {
-			err = e
+			acc.AddError(e)
 			continue
 		}
 		e = ipt.parseAndGather(data, acc)
 		if e != nil {
-			err = e
+			acc.AddError(e)
 			continue
 		}
 	}
-	return err
+	return nil
 }
 
 func (ipt *Iptables) chainList(table, chain string) (string, error) {

plugins/inputs/iptables/iptables_test.go

@@ -141,7 +141,7 @@ func TestIptables_Gather(t *testing.T) {
 			},
 		}
 		acc := new(testutil.Accumulator)
-		err := ipt.Gather(acc)
+		err := acc.GatherError(ipt.Gather)
 		if !reflect.DeepEqual(tt.err, err) {
 			t.Errorf("%d: expected error '%#v' got '%#v'", i, tt.err, err)
 		}
@@ -199,7 +199,7 @@ func TestIptables_Gather_listerError(t *testing.T) {
 		},
 	}
 	acc := new(testutil.Accumulator)
-	err := ipt.Gather(acc)
+	err := acc.GatherError(ipt.Gather)
 	if !reflect.DeepEqual(err, errFoo) {
 		t.Errorf("Expected error %#v got\n%#v\n", errFoo, err)
 	}

plugins/inputs/jolokia/jolokia_test.go

@@ -158,7 +158,7 @@ func TestHttpJsonMultiValue(t *testing.T) {
 	jolokia := genJolokiaClientStub(validMultiValueJSON, 200, Servers, []Metric{HeapMetric})
 
 	var acc testutil.Accumulator
-	err := jolokia.Gather(&acc)
+	err := acc.GatherError(jolokia.Gather)
 
 	assert.Nil(t, err)
 	assert.Equal(t, 1, len(acc.Metrics))
@@ -210,7 +210,7 @@ func TestHttpJsonThreeLevelMultiValue(t *testing.T) {
 	jolokia := genJolokiaClientStub(validThreeLevelMultiValueJSON, 200, Servers, []Metric{HeapMetric})
 
 	var acc testutil.Accumulator
-	err := jolokia.Gather(&acc)
+	err := acc.GatherError(jolokia.Gather)
 
 	assert.Nil(t, err)
 	assert.Equal(t, 1, len(acc.Metrics))
@@ -238,17 +238,18 @@ func TestHttpJsonThreeLevelMultiValue(t *testing.T) {
 }
 
 // Test that the proper values are ignored or collected
-func TestHttpJsonOn404(t *testing.T) {
+func TestHttp404(t *testing.T) {
 
-	jolokia := genJolokiaClientStub(validMultiValueJSON, 404, Servers,
+	jolokia := genJolokiaClientStub(invalidJSON, 404, Servers,
 		[]Metric{UsedHeapMetric})
 
 	var acc testutil.Accumulator
 	acc.SetDebug(true)
-	err := jolokia.Gather(&acc)
+	err := acc.GatherError(jolokia.Gather)
 
-	assert.Nil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, len(acc.Metrics))
+	assert.Contains(t, err.Error(), "has status code 404")
 }
 
 // Test that the proper values are ignored or collected
@@ -259,8 +260,9 @@ func TestHttpInvalidJson(t *testing.T) {
 
 	var acc testutil.Accumulator
 	acc.SetDebug(true)
-	err := jolokia.Gather(&acc)
+	err := acc.GatherError(jolokia.Gather)
 
-	assert.Nil(t, err)
+	assert.Error(t, err)
 	assert.Equal(t, 0, len(acc.Metrics))
+	assert.Contains(t, err.Error(), "Error decoding JSON response")
 }

plugins/inputs/kafka_consumer/kafka_consumer_integration_test.go

@@ -59,7 +59,7 @@ func TestReadsMetricsFromKafka(t *testing.T) {
 	waitForPoint(&acc, t)
 
 	// Gather points
-	err = k.Gather(&acc)
+	err = acc.GatherError(k.Gather)
 	require.NoError(t, err)
 	if len(acc.Metrics) == 1 {
 		point := acc.Metrics[0]

plugins/inputs/kafka_consumer/kafka_consumer_test.go

@@ -92,7 +92,7 @@ func TestRunParserAndGather(t *testing.T) {
 	in <- saramaMsg(testMsg)
 	acc.Wait(1)
 
-	k.Gather(&acc)
+	acc.GatherError(k.Gather)
 
 	assert.Equal(t, acc.NFields(), 1)
 	acc.AssertContainsFields(t, "cpu_load_short",
@@ -111,7 +111,7 @@ func TestRunParserAndGatherGraphite(t *testing.T) {
 	in <- saramaMsg(testMsgGraphite)
 	acc.Wait(1)
 
-	k.Gather(&acc)
+	acc.GatherError(k.Gather)
 
 	assert.Equal(t, acc.NFields(), 1)
 	acc.AssertContainsFields(t, "cpu_load_short_graphite",
@@ -130,7 +130,7 @@ func TestRunParserAndGatherJSON(t *testing.T) {
 	in <- saramaMsg(testMsgJSON)
 	acc.Wait(1)
 
-	k.Gather(&acc)
+	acc.GatherError(k.Gather)
 
 	assert.Equal(t, acc.NFields(), 2)
 	acc.AssertContainsFields(t, "kafka_json_test",

plugins/inputs/kubernetes/kubernetes.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -72,14 +71,13 @@ func (k *Kubernetes) Description() string {
 //Gather collects kubernetes metrics from a given URL
 func (k *Kubernetes) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup
-	errChan := errchan.New(1)
 	wg.Add(1)
 	go func(k *Kubernetes) {
 		defer wg.Done()
-		errChan.C <- k.gatherSummary(k.URL, acc)
+		acc.AddError(k.gatherSummary(k.URL, acc))
 	}(k)
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func buildURL(endpoint string, base string) (*url.URL, error) {

plugins/inputs/kubernetes/kubernetes_test.go

@@ -22,7 +22,7 @@ func TestKubernetesStats(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := k.Gather(&acc)
+	err := acc.GatherError(k.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{

plugins/inputs/leofs/leofs.go

@@ -154,15 +154,16 @@ func (l *LeoFS) Gather(acc telegraf.Accumulator) error {
 		return nil
 	}
 	var wg sync.WaitGroup
-	var outerr error
 	for _, endpoint := range l.Servers {
 		_, err := url.Parse(endpoint)
 		if err != nil {
-			return fmt.Errorf("Unable to parse the address:%s, err:%s", endpoint, err)
+			acc.AddError(fmt.Errorf("Unable to parse the address:%s, err:%s", endpoint, err))
+			continue
 		}
 		port, err := retrieveTokenAfterColon(endpoint)
 		if err != nil {
-			return err
+			acc.AddError(err)
+			continue
 		}
 		st, ok := serverTypeMapping[port]
 		if !ok {
@@ -171,11 +172,11 @@ func (l *LeoFS) Gather(acc telegraf.Accumulator) error {
 		wg.Add(1)
 		go func(endpoint string, st ServerType) {
 			defer wg.Done()
-			outerr = l.gatherServer(endpoint, st, acc)
+			acc.AddError(l.gatherServer(endpoint, st, acc))
 		}(endpoint, st)
 	}
 	wg.Wait()
-	return outerr
+	return nil
 }
 
 func (l *LeoFS) gatherServer(

plugins/inputs/leofs/leofs_test.go

@@ -146,7 +146,7 @@ func testMain(t *testing.T, code string, endpoint string, serverType ServerType)
 	var acc testutil.Accumulator
 	acc.SetDebug(true)
 
-	err := l.Gather(&acc)
+	err := acc.GatherError(l.Gather)
 	require.NoError(t, err)
 
 	floatMetrics := KeyMapping[serverType]

plugins/inputs/logparser/logparser.go

@@ -9,7 +9,6 @@ import (
 	"github.com/influxdata/tail"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/internal/globpath"
 	"github.com/influxdata/telegraf/plugins/inputs"
 
@@ -118,14 +117,15 @@ func (l *LogParserPlugin) Start(acc telegraf.Accumulator) error {
 	}
 
 	// compile log parser patterns:
-	errChan := errchan.New(len(l.parsers))
+	var haveError bool
 	for _, parser := range l.parsers {
 		if err := parser.Compile(); err != nil {
-			errChan.C <- err
+			acc.AddError(err)
+			haveError = true
 		}
 	}
-	if err := errChan.Error(); err != nil {
+	if haveError {
-		return err
+		return nil
 	}
 
 	l.wg.Add(1)
@@ -143,8 +143,6 @@ func (l *LogParserPlugin) tailNewfiles(fromBeginning bool) error {
 		seek.Offset = 0
 	}
 
-	errChan := errchan.New(len(l.Files))
-
 	// Create a "tailer" for each file
 	for _, filepath := range l.Files {
 		g, err := globpath.Compile(filepath)
@@ -153,7 +151,6 @@ func (l *LogParserPlugin) tailNewfiles(fromBeginning bool) error {
 			continue
 		}
 		files := g.Match()
-		errChan = errchan.New(len(files))
 
 		for file, _ := range files {
 			if _, ok := l.tailers[file]; ok {
@@ -168,7 +165,7 @@ func (l *LogParserPlugin) tailNewfiles(fromBeginning bool) error {
 					Location:  &seek,
 					MustExist: true,
 				})
-			errChan.C <- err
+			l.acc.AddError(err)
 
 			// create a goroutine for each "tailer"
 			l.wg.Add(1)
@@ -177,7 +174,7 @@ func (l *LogParserPlugin) tailNewfiles(fromBeginning bool) error {
 		}
 	}
 
-	return errChan.Error()
+	return nil
 }
 
 // receiver is launched as a goroutine to continuously watch a tailed logfile

plugins/inputs/logparser/logparser_test.go

@@ -38,7 +38,10 @@ func TestGrokParseLogFilesNonExistPattern(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.Error(t, logparser.Start(&acc))
+	logparser.Start(&acc)
+	if assert.NotEmpty(t, acc.Errors) {
+		assert.Error(t, acc.Errors[0])
+	}
 
 	logparser.Stop()
 }
@@ -106,7 +109,7 @@ func TestGrokParseLogFilesAppearLater(t *testing.T) {
 	os.Symlink(
 		thisdir+"grok/testdata/test_a.log",
 		emptydir+"/test_a.log")
-	assert.NoError(t, logparser.Gather(&acc))
+	assert.NoError(t, acc.GatherError(logparser.Gather))
 	acc.Wait(1)
 
 	logparser.Stop()

plugins/inputs/mailchimp/mailchimp_test.go

@@ -140,7 +140,7 @@ func TestMailChimpGatherReport(t *testing.T) {
 
 }
 
-func TestMailChimpGatherError(t *testing.T) {
+func TestMailChimpGatherErroror(t *testing.T) {
 	ts := httptest.NewServer(
 		http.HandlerFunc(
 			func(w http.ResponseWriter, r *http.Request) {

plugins/inputs/memcached/memcached.go

@@ -9,7 +9,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -73,16 +72,15 @@ func (m *Memcached) Gather(acc telegraf.Accumulator) error {
 		return m.gatherServer(":11211", false, acc)
 	}
 
-	errChan := errchan.New(len(m.Servers) + len(m.UnixSockets))
 	for _, serverAddress := range m.Servers {
-		errChan.C <- m.gatherServer(serverAddress, false, acc)
+		acc.AddError(m.gatherServer(serverAddress, false, acc))
 	}
 
 	for _, unixAddress := range m.UnixSockets {
-		errChan.C <- m.gatherServer(unixAddress, true, acc)
+		acc.AddError(m.gatherServer(unixAddress, true, acc))
 	}
 
-	return errChan.Error()
+	return nil
 }
 
 func (m *Memcached) gatherServer(

plugins/inputs/memcached/memcached_test.go

@@ -21,7 +21,7 @@ func TestMemcachedGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := m.Gather(&acc)
+	err := acc.GatherError(m.Gather)
 	require.NoError(t, err)
 
 	intMetrics := []string{"get_hits", "get_misses", "evictions",

plugins/inputs/mesos/mesos.go

@@ -8,7 +8,6 @@ import (
 	"net"
 	"net/http"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -96,16 +95,13 @@ func (m *Mesos) SetDefaults() {
 // Gather() metrics from given list of Mesos Masters
 func (m *Mesos) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup
-	var errorChannel chan error
 
 	m.SetDefaults()
 
-	errorChannel = make(chan error, len(m.Masters)+2*len(m.Slaves))
-
 	for _, v := range m.Masters {
 		wg.Add(1)
 		go func(c string) {
-			errorChannel <- m.gatherMainMetrics(c, ":5050", MASTER, acc)
+			acc.AddError(m.gatherMainMetrics(c, ":5050", MASTER, acc))
 			wg.Done()
 			return
 		}(v)
@@ -114,7 +110,7 @@ func (m *Mesos) Gather(acc telegraf.Accumulator) error {
 	for _, v := range m.Slaves {
 		wg.Add(1)
 		go func(c string) {
-			errorChannel <- m.gatherMainMetrics(c, ":5051", SLAVE, acc)
+			acc.AddError(m.gatherMainMetrics(c, ":5051", SLAVE, acc))
 			wg.Done()
 			return
 		}(v)
@@ -125,26 +121,14 @@ func (m *Mesos) Gather(acc telegraf.Accumulator) error {
 
 		// wg.Add(1)
 		// go func(c string) {
-		// 	errorChannel <- m.gatherSlaveTaskMetrics(c, ":5051", acc)
+		// 	acc.AddError(m.gatherSlaveTaskMetrics(c, ":5051", acc))
 		// 	wg.Done()
 		// 	return
 		// }(v)
 	}
 
 	wg.Wait()
-	close(errorChannel)
-	errorStrings := []string{}
 
-	// Gather all errors for returning them at once
-	for err := range errorChannel {
-		if err != nil {
-			errorStrings = append(errorStrings, err.Error())
-		}
-	}
-
-	if len(errorStrings) > 0 {
-		return errors.New(strings.Join(errorStrings, "\n"))
-	}
 	return nil
 }
 

plugins/inputs/mesos/mesos_test.go

@@ -282,7 +282,7 @@ func TestMesosMaster(t *testing.T) {
 		Timeout: 10,
 	}
 
-	err := m.Gather(&acc)
+	err := acc.GatherError(m.Gather)
 
 	if err != nil {
 		t.Errorf(err.Error())
@@ -330,7 +330,7 @@ func TestMesosSlave(t *testing.T) {
 		Timeout: 10,
 	}
 
-	err := m.Gather(&acc)
+	err := acc.GatherError(m.Gather)
 
 	if err != nil {
 		t.Errorf(err.Error())

plugins/inputs/mongodb/mongodb.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 	"gopkg.in/mgo.v2"
 )
@@ -73,11 +72,11 @@ func (m *MongoDB) Gather(acc telegraf.Accumulator) error {
 	}
 
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(m.Servers))
 	for _, serv := range m.Servers {
 		u, err := url.Parse(serv)
 		if err != nil {
-			return fmt.Errorf("Unable to parse to address '%s': %s", serv, err)
+			acc.AddError(fmt.Errorf("Unable to parse to address '%s': %s", serv, err))
+			continue
 		} else if u.Scheme == "" {
 			u.Scheme = "mongodb"
 			// fallback to simple string based address (i.e. "10.0.0.1:10000")
@@ -89,12 +88,12 @@ func (m *MongoDB) Gather(acc telegraf.Accumulator) error {
 		wg.Add(1)
 		go func(srv *Server) {
 			defer wg.Done()
-			errChan.C <- m.gatherServer(srv, acc)
+			acc.AddError(m.gatherServer(srv, acc))
 		}(m.getMongoServer(u))
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func (m *MongoDB) getMongoServer(url *url.URL) *Server {

plugins/inputs/mysql/mysql.go

@@ -11,7 +11,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 
 	"github.com/go-sql-driver/mysql"
@@ -137,19 +136,18 @@ func (m *Mysql) Gather(acc telegraf.Accumulator) error {
 		m.InitMysql()
 	}
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(m.Servers))
 
 	// Loop through each server and collect metrics
 	for _, server := range m.Servers {
 		wg.Add(1)
 		go func(s string) {
 			defer wg.Done()
-			errChan.C <- m.gatherServer(s, acc)
+			acc.AddError(m.gatherServer(s, acc))
 		}(server)
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 type mapping struct {

plugins/inputs/nginx/nginx.go

@@ -12,7 +12,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -35,23 +34,22 @@ func (n *Nginx) Description() string {
 
 func (n *Nginx) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(n.Urls))
 
 	for _, u := range n.Urls {
 		addr, err := url.Parse(u)
 		if err != nil {
-			return fmt.Errorf("Unable to parse address '%s': %s", u, err)
+			acc.AddError(fmt.Errorf("Unable to parse address '%s': %s", u, err))
 		}
 
 		wg.Add(1)
 		go func(addr *url.URL) {
 			defer wg.Done()
-			errChan.C <- n.gatherUrl(addr, acc)
+			acc.AddError(n.gatherUrl(addr, acc))
 		}(addr)
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 var tr = &http.Transport{

plugins/inputs/nginx/nginx_test.go

@@ -64,8 +64,8 @@ func TestNginxGeneratesMetrics(t *testing.T) {
 	var acc_nginx testutil.Accumulator
 	var acc_tengine testutil.Accumulator
 
-	err_nginx := n.Gather(&acc_nginx)
+	err_nginx := acc_nginx.GatherError(n.Gather)
-	err_tengine := nt.Gather(&acc_tengine)
+	err_tengine := acc_tengine.GatherError(nt.Gather)
 
 	require.NoError(t, err_nginx)
 	require.NoError(t, err_tengine)

plugins/inputs/nsq/nsq.go

@@ -32,7 +32,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -66,17 +65,16 @@ func (n *NSQ) Description() string {
 
 func (n *NSQ) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(n.Endpoints))
 	for _, e := range n.Endpoints {
 		wg.Add(1)
 		go func(e string) {
 			defer wg.Done()
-			errChan.C <- n.gatherEndpoint(e, acc)
+			acc.AddError(n.gatherEndpoint(e, acc))
 		}(e)
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 var tr = &http.Transport{

plugins/inputs/nsq/nsq_test.go

@@ -24,7 +24,7 @@ func TestNSQStats(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err := n.Gather(&acc)
+	err := acc.GatherError(n.Gather)
 	require.NoError(t, err)
 
 	u, err := url.Parse(ts.URL)

plugins/inputs/nsq_consumer/nsq_consumer.go

@@ -1,7 +1,7 @@
 package nsq_consumer
 
 import (
-	"log"
+	"fmt"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
@@ -62,7 +62,7 @@ func (n *NSQConsumer) Start(acc telegraf.Accumulator) error {
 	n.consumer.AddConcurrentHandlers(nsq.HandlerFunc(func(message *nsq.Message) error {
 		metrics, err := n.parser.Parse(message.Body)
 		if err != nil {
-			log.Printf("E! NSQConsumer Parse Error\nmessage:%s\nerror:%s", string(message.Body), err.Error())
+			acc.AddError(fmt.Errorf("E! NSQConsumer Parse Error\nmessage:%s\nerror:%s", string(message.Body), err.Error()))
 			return nil
 		}
 		for _, metric := range metrics {

plugins/inputs/ntpq/ntpq.go

@@ -5,7 +5,7 @@ package ntpq
 import (
 	"bufio"
 	"bytes"
-	"log"
+	"fmt"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -132,7 +132,7 @@ func (n *NTPQ) Gather(acc telegraf.Accumulator) error {
 					case strings.HasSuffix(when, "h"):
 						m, err := strconv.Atoi(strings.TrimSuffix(fields[index], "h"))
 						if err != nil {
-							log.Printf("E! Error ntpq: parsing int: %s", fields[index])
+							acc.AddError(fmt.Errorf("E! Error ntpq: parsing int: %s", fields[index]))
 							continue
 						}
 						// seconds in an hour
@@ -141,7 +141,7 @@ func (n *NTPQ) Gather(acc telegraf.Accumulator) error {
 					case strings.HasSuffix(when, "d"):
 						m, err := strconv.Atoi(strings.TrimSuffix(fields[index], "d"))
 						if err != nil {
-							log.Printf("E! Error ntpq: parsing int: %s", fields[index])
+							acc.AddError(fmt.Errorf("E! Error ntpq: parsing int: %s", fields[index]))
 							continue
 						}
 						// seconds in a day
@@ -150,7 +150,7 @@ func (n *NTPQ) Gather(acc telegraf.Accumulator) error {
 					case strings.HasSuffix(when, "m"):
 						m, err := strconv.Atoi(strings.TrimSuffix(fields[index], "m"))
 						if err != nil {
-							log.Printf("E! Error ntpq: parsing int: %s", fields[index])
+							acc.AddError(fmt.Errorf("E! Error ntpq: parsing int: %s", fields[index]))
 							continue
 						}
 						// seconds in a day
@@ -161,7 +161,7 @@ func (n *NTPQ) Gather(acc telegraf.Accumulator) error {
 
 				m, err := strconv.Atoi(fields[index])
 				if err != nil {
-					log.Printf("E! Error ntpq: parsing int: %s", fields[index])
+					acc.AddError(fmt.Errorf("E! Error ntpq: parsing int: %s", fields[index]))
 					continue
 				}
 				mFields[key] = int64(m)
@@ -178,7 +178,7 @@ func (n *NTPQ) Gather(acc telegraf.Accumulator) error {
 
 				m, err := strconv.ParseFloat(fields[index], 64)
 				if err != nil {
-					log.Printf("E! Error ntpq: parsing float: %s", fields[index])
+					acc.AddError(fmt.Errorf("E! Error ntpq: parsing float: %s", fields[index]))
 					continue
 				}
 				mFields[key] = m

plugins/inputs/ntpq/ntpq_test.go

@@ -21,7 +21,7 @@ func TestSingleNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(101),
@@ -51,7 +51,7 @@ func TestMissingJitterField(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(101),
@@ -80,7 +80,7 @@ func TestBadIntNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.Error(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(101),
@@ -109,7 +109,7 @@ func TestBadFloatNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.Error(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(2),
@@ -138,7 +138,7 @@ func TestDaysNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(172800),
@@ -168,7 +168,7 @@ func TestHoursNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(7200),
@@ -198,7 +198,7 @@ func TestMinutesNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(120),
@@ -228,7 +228,7 @@ func TestBadWhenNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.Error(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"poll":   int64(256),
@@ -257,7 +257,7 @@ func TestMultiNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"delay":  float64(54.033),
@@ -303,7 +303,7 @@ func TestBadHeaderNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(101),
@@ -333,7 +333,7 @@ func TestMissingDelayColumnNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.NoError(t, n.Gather(&acc))
+	assert.NoError(t, acc.GatherError(n.Gather))
 
 	fields := map[string]interface{}{
 		"when":   int64(101),
@@ -361,7 +361,7 @@ func TestFailedNTPQ(t *testing.T) {
 	}
 
 	acc := testutil.Accumulator{}
-	assert.Error(t, n.Gather(&acc))
+	assert.Error(t, acc.GatherError(n.Gather))
 }
 
 type tester struct {

plugins/inputs/phpfpm/phpfpm.go

@@ -80,19 +80,17 @@ func (g *phpfpm) Gather(acc telegraf.Accumulator) error {
 
 	var wg sync.WaitGroup
 
-	var outerr error
-
 	for _, serv := range g.Urls {
 		wg.Add(1)
 		go func(serv string) {
 			defer wg.Done()
-			outerr = g.gatherServer(serv, acc)
+			acc.AddError(g.gatherServer(serv, acc))
 		}(serv)
 	}
 
 	wg.Wait()
 
-	return outerr
+	return nil
 }
 
 // Request status page to get stat raw data and import it

plugins/inputs/phpfpm/phpfpm_test.go

@@ -35,7 +35,7 @@ func TestPhpFpmGeneratesMetrics_From_Http(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := r.Gather(&acc)
+	err := acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -75,7 +75,7 @@ func TestPhpFpmGeneratesMetrics_From_Fcgi(t *testing.T) {
 	}
 
 	var acc testutil.Accumulator
-	err = r.Gather(&acc)
+	err = acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -119,7 +119,7 @@ func TestPhpFpmGeneratesMetrics_From_Socket(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err = r.Gather(&acc)
+	err = acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -163,7 +163,7 @@ func TestPhpFpmGeneratesMetrics_From_Socket_Custom_Status_Path(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err = r.Gather(&acc)
+	err = acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	tags := map[string]string{
@@ -193,7 +193,7 @@ func TestPhpFpmDefaultGetFromLocalhost(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := r.Gather(&acc)
+	err := acc.GatherError(r.Gather)
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "127.0.0.1/status")
 }
@@ -205,7 +205,7 @@ func TestPhpFpmGeneratesMetrics_Throw_Error_When_Fpm_Status_Is_Not_Responding(t
 
 	var acc testutil.Accumulator
 
-	err := r.Gather(&acc)
+	err := acc.GatherError(r.Gather)
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), `Unable to connect to phpfpm status page 'http://aninvalidone': Get http://aninvalidone: dial tcp: lookup aninvalidone`)
 }
@@ -217,7 +217,7 @@ func TestPhpFpmGeneratesMetrics_Throw_Error_When_Socket_Path_Is_Invalid(t *testi
 
 	var acc testutil.Accumulator
 
-	err := r.Gather(&acc)
+	err := acc.GatherError(r.Gather)
 	require.Error(t, err)
 	assert.Equal(t, `Socket doesn't exist  '/tmp/invalid.sock': stat /tmp/invalid.sock: no such file or directory`, err.Error())
 

plugins/inputs/ping/ping.go

@@ -68,7 +68,6 @@ func (_ *Ping) SampleConfig() string {
 func (p *Ping) Gather(acc telegraf.Accumulator) error {
 
 	var wg sync.WaitGroup
-	errorChannel := make(chan error, len(p.Urls)*2)
 
 	// Spin off a go routine for each url to ping
 	for _, url := range p.Urls {
@@ -80,14 +79,14 @@ func (p *Ping) Gather(acc telegraf.Accumulator) error {
 			out, err := p.pingHost(totalTimeout, args...)
 			if err != nil {
 				// Combine go err + stderr output
-				errorChannel <- errors.New(
+				acc.AddError(errors.New(
-					strings.TrimSpace(out) + ", " + err.Error())
+					strings.TrimSpace(out) + ", " + err.Error()))
 			}
 			tags := map[string]string{"url": u}
 			trans, rec, avg, stddev, err := processPingOutput(out)
 			if err != nil {
 				// fatal error
-				errorChannel <- err
+				acc.AddError(err)
 				return
 			}
 			// Calculate packet loss percentage
@@ -108,18 +107,8 @@ func (p *Ping) Gather(acc telegraf.Accumulator) error {
 	}
 
 	wg.Wait()
-	close(errorChannel)
 
-	// Get all errors and return them as one giant error
+	return nil
-	errorStrings := []string{}
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
-
-	if len(errorStrings) == 0 {
-		return nil
-	}
-	return errors.New(strings.Join(errorStrings, "\n"))
 }
 
 func hostPinger(timeout float64, args ...string) (string, error) {

plugins/inputs/ping/ping_test.go

@@ -144,7 +144,7 @@ func TestPingGather(t *testing.T) {
 		pingHost: mockHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted":   5,
@@ -182,7 +182,7 @@ func TestLossyPingGather(t *testing.T) {
 		pingHost: mockLossyHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted":   5,
@@ -215,7 +215,7 @@ func TestBadPingGather(t *testing.T) {
 		pingHost: mockErrorHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	tags := map[string]string{"url": "www.amazon.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 2,
@@ -237,7 +237,7 @@ func TestFatalPingGather(t *testing.T) {
 		pingHost: mockFatalHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	assert.False(t, acc.HasMeasurement("packets_transmitted"),
 		"Fatal ping should not have packet measurements")
 	assert.False(t, acc.HasMeasurement("packets_received"),

plugins/inputs/ping/ping_windows_test.go

@@ -69,7 +69,7 @@ func TestPingGather(t *testing.T) {
 		pingHost: mockHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 4,
@@ -112,7 +112,7 @@ func TestBadPingGather(t *testing.T) {
 		pingHost: mockErrorHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	tags := map[string]string{"url": "www.amazon.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 4,
@@ -155,7 +155,7 @@ func TestLossyPingGather(t *testing.T) {
 		pingHost: mockLossyHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
 		"packets_transmitted": 9,
@@ -214,7 +214,7 @@ func TestFatalPingGather(t *testing.T) {
 		pingHost: mockFatalHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 	assert.True(t, acc.HasFloatField("ping", "errors"),
 		"Fatal ping should have packet measurements")
 	assert.False(t, acc.HasIntField("ping", "packets_transmitted"),
@@ -259,7 +259,7 @@ func TestUnreachablePingGather(t *testing.T) {
 		pingHost: mockUnreachableHostPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{
@@ -305,7 +305,7 @@ func TestTTLExpiredPingGather(t *testing.T) {
 		pingHost: mockTTLExpiredPinger,
 	}
 
-	p.Gather(&acc)
+	acc.GatherError(p.Gather)
 
 	tags := map[string]string{"url": "www.google.com"}
 	fields := map[string]interface{}{

plugins/inputs/postgresql_extensible/postgresql_extensible.go

@@ -170,7 +170,8 @@ func (p *Postgresql) Gather(acc telegraf.Accumulator) error {
 		if p.Query[i].Version <= db_version {
 			rows, err := db.Query(sql_query)
 			if err != nil {
-				return err
+				acc.AddError(err)
+				continue
 			}
 
 			defer rows.Close()
@@ -178,7 +179,8 @@ func (p *Postgresql) Gather(acc telegraf.Accumulator) error {
 			// grab the column information from the result
 			p.OrderedColumns, err = rows.Columns()
 			if err != nil {
-				return err
+				acc.AddError(err)
+				continue
 			} else {
 				for _, v := range p.OrderedColumns {
 					p.AllColumns = append(p.AllColumns, v)
@@ -195,7 +197,8 @@ func (p *Postgresql) Gather(acc telegraf.Accumulator) error {
 			for rows.Next() {
 				err = p.accRow(meas_name, rows, acc)
 				if err != nil {
-					return err
+					acc.AddError(err)
+					break
 				}
 			}
 		}

plugins/inputs/postgresql_extensible/postgresql_extensible_test.go

@@ -26,7 +26,7 @@ func TestPostgresqlGeneratesMetrics(t *testing.T) {
 		},
 	}
 	var acc testutil.Accumulator
-	err := p.Gather(&acc)
+	err := acc.GatherError(p.Gather)
 	require.NoError(t, err)
 
 	availableColumns := make(map[string]bool)
@@ -114,7 +114,7 @@ func TestPostgresqlIgnoresUnwantedColumns(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := p.Gather(&acc)
+	err := acc.GatherError(p.Gather)
 	require.NoError(t, err)
 
 	for col := range p.IgnoredColumns() {

plugins/inputs/powerdns/powerdns.go

@@ -41,7 +41,7 @@ func (p *Powerdns) Gather(acc telegraf.Accumulator) error {
 
 	for _, serverSocket := range p.UnixSockets {
 		if err := p.gatherServer(serverSocket, acc); err != nil {
-			return err
+			acc.AddError(err)
 		}
 	}
 

plugins/inputs/powerdns/powerdns_test.go

@@ -90,7 +90,7 @@ func TestMemcachedGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err = p.Gather(&acc)
+	err = acc.GatherError(p.Gather)
 	require.NoError(t, err)
 
 	intMetrics := []string{"corrupt-packets", "deferred-cache-inserts",

plugins/inputs/procstat/procstat.go

@@ -71,9 +71,8 @@ func (p *Procstat) Gather(acc telegraf.Accumulator) error {
 
 	procs, err := p.updateProcesses(p.procs)
 	if err != nil {
-		return fmt.Errorf(
+		acc.AddError(fmt.Errorf("E! Error: procstat getting process, exe: [%s] pidfile: [%s] pattern: [%s] user: [%s] %s",
-			"E! Error: procstat getting process, exe: [%s] pidfile: [%s] pattern: [%s] user: [%s] %s",
+			p.Exe, p.PidFile, p.Pattern, p.User, err.Error()))
-			p.Exe, p.PidFile, p.Pattern, p.User, err.Error())
 	}
 	p.procs = procs
 

plugins/inputs/procstat/procstat_test.go

@@ -108,7 +108,7 @@ func TestGather_CreateProcessErrorOk(t *testing.T) {
 			return nil, fmt.Errorf("createProcess error")
 		},
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 }
 
 func TestGather_CreatePIDFinderError(t *testing.T) {
@@ -120,7 +120,7 @@ func TestGather_CreatePIDFinderError(t *testing.T) {
 		},
 		createProcess: newTestProc,
 	}
-	require.Error(t, p.Gather(&acc))
+	require.Error(t, acc.GatherError(p.Gather))
 }
 
 func TestGather_ProcessName(t *testing.T) {
@@ -132,7 +132,7 @@ func TestGather_ProcessName(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.Equal(t, "custom_name", acc.TagValue("procstat", "process_name"))
 }
@@ -146,7 +146,7 @@ func TestGather_NoProcessNameUsesReal(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.True(t, acc.HasTag("procstat", "process_name"))
 }
@@ -159,7 +159,7 @@ func TestGather_NoPidTag(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 	assert.True(t, acc.HasInt32Field("procstat", "pid"))
 	assert.False(t, acc.HasTag("procstat", "pid"))
 }
@@ -173,7 +173,7 @@ func TestGather_PidTag(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 	assert.Equal(t, "42", acc.TagValue("procstat", "pid"))
 	assert.False(t, acc.HasInt32Field("procstat", "pid"))
 }
@@ -187,7 +187,7 @@ func TestGather_Prefix(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 	assert.True(t, acc.HasInt32Field("procstat", "custom_prefix_num_fds"))
 }
 
@@ -199,7 +199,7 @@ func TestGather_Exe(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.Equal(t, exe, acc.TagValue("procstat", "exe"))
 }
@@ -213,7 +213,7 @@ func TestGather_User(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.Equal(t, user, acc.TagValue("procstat", "user"))
 }
@@ -227,7 +227,7 @@ func TestGather_Pattern(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.Equal(t, pattern, acc.TagValue("procstat", "pattern"))
 }
@@ -239,7 +239,7 @@ func TestGather_MissingPidMethod(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.Error(t, p.Gather(&acc))
+	require.Error(t, acc.GatherError(p.Gather))
 }
 
 func TestGather_PidFile(t *testing.T) {
@@ -251,7 +251,7 @@ func TestGather_PidFile(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   newTestProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.Equal(t, pidfile, acc.TagValue("procstat", "pidfile"))
 }
@@ -266,7 +266,7 @@ func TestGather_PercentFirstPass(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   NewProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.True(t, acc.HasFloatField("procstat", "cpu_time_user"))
 	assert.False(t, acc.HasFloatField("procstat", "cpu_usage"))
@@ -282,8 +282,8 @@ func TestGather_PercentSecondPass(t *testing.T) {
 		createPIDFinder: pidFinder([]PID{pid}, nil),
 		createProcess:   NewProc,
 	}
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
-	require.NoError(t, p.Gather(&acc))
+	require.NoError(t, acc.GatherError(p.Gather))
 
 	assert.True(t, acc.HasFloatField("procstat", "cpu_time_user"))
 	assert.True(t, acc.HasFloatField("procstat", "cpu_usage"))

plugins/inputs/prometheus/prometheus.go

@@ -67,19 +67,17 @@ var ErrProtocolError = errors.New("prometheus protocol error")
 func (p *Prometheus) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup
 
-	var outerr error
-
 	for _, serv := range p.Urls {
 		wg.Add(1)
 		go func(serv string) {
 			defer wg.Done()
-			outerr = p.gatherURL(serv, acc)
+			acc.AddError(p.gatherURL(serv, acc))
 		}(serv)
 	}
 
 	wg.Wait()
 
-	return outerr
+	return nil
 }
 
 var tr = &http.Transport{

plugins/inputs/prometheus/prometheus_test.go

@@ -41,7 +41,7 @@ func TestPrometheusGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := p.Gather(&acc)
+	err := acc.GatherError(p.Gather)
 	require.NoError(t, err)
 
 	assert.True(t, acc.HasFloatField("go_gc_duration_seconds", "count"))

plugins/inputs/rabbitmq/rabbitmq.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -136,7 +135,7 @@ type Node struct {
 }
 
 // gatherFunc ...
-type gatherFunc func(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error)
+type gatherFunc func(r *RabbitMQ, acc telegraf.Accumulator)
 
 var gatherFunctions = []gatherFunc{gatherOverview, gatherNodes, gatherQueues}
 
@@ -198,16 +197,15 @@ func (r *RabbitMQ) Gather(acc telegraf.Accumulator) error {
 
 	var wg sync.WaitGroup
 	wg.Add(len(gatherFunctions))
-	errChan := errchan.New(len(gatherFunctions))
 	for _, f := range gatherFunctions {
 		go func(gf gatherFunc) {
 			defer wg.Done()
-			gf(r, acc, errChan.C)
+			gf(r, acc)
 		}(f)
 	}
 	wg.Wait()
 
-	return errChan.Error()
+	return nil
 }
 
 func (r *RabbitMQ) requestJSON(u string, target interface{}) error {
@@ -245,17 +243,17 @@ func (r *RabbitMQ) requestJSON(u string, target interface{}) error {
 	return nil
 }
 
-func gatherOverview(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error) {
+func gatherOverview(r *RabbitMQ, acc telegraf.Accumulator) {
 	overview := &OverviewResponse{}
 
 	err := r.requestJSON("/api/overview", &overview)
 	if err != nil {
-		errChan <- err
+		acc.AddError(err)
 		return
 	}
 
 	if overview.QueueTotals == nil || overview.ObjectTotals == nil || overview.MessageStats == nil {
-		errChan <- fmt.Errorf("Wrong answer from rabbitmq. Probably auth issue")
+		acc.AddError(fmt.Errorf("Wrong answer from rabbitmq. Probably auth issue"))
 		return
 	}
 
@@ -277,16 +275,14 @@ func gatherOverview(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error) {
 		"messages_published": overview.MessageStats.Publish,
 	}
 	acc.AddFields("rabbitmq_overview", fields, tags)
-
-	errChan <- nil
 }
 
-func gatherNodes(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error) {
+func gatherNodes(r *RabbitMQ, acc telegraf.Accumulator) {
 	nodes := make([]Node, 0)
 	// Gather information about nodes
 	err := r.requestJSON("/api/nodes", &nodes)
 	if err != nil {
-		errChan <- err
+		acc.AddError(err)
 		return
 	}
 	now := time.Now()
@@ -314,16 +310,14 @@ func gatherNodes(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error) {
 		}
 		acc.AddFields("rabbitmq_node", fields, tags, now)
 	}
-
-	errChan <- nil
 }
 
-func gatherQueues(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error) {
+func gatherQueues(r *RabbitMQ, acc telegraf.Accumulator) {
 	// Gather information about queues
 	queues := make([]Queue, 0)
 	err := r.requestJSON("/api/queues", &queues)
 	if err != nil {
-		errChan <- err
+		acc.AddError(err)
 		return
 	}
 
@@ -371,8 +365,6 @@ func gatherQueues(r *RabbitMQ, acc telegraf.Accumulator, errChan chan error) {
 			tags,
 		)
 	}
-
-	errChan <- nil
 }
 
 func (r *RabbitMQ) shouldGatherNode(node Node) bool {

plugins/inputs/rabbitmq/rabbitmq_test.go

@@ -399,7 +399,7 @@ func TestRabbitMQGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := r.Gather(&acc)
+	err := acc.GatherError(r.Gather)
 	require.NoError(t, err)
 
 	intMetrics := []string{

plugins/inputs/raindrops/raindrops.go

@@ -35,24 +35,24 @@ func (r *Raindrops) Description() string {
 
 func (r *Raindrops) Gather(acc telegraf.Accumulator) error {
 	var wg sync.WaitGroup
-	var outerr error
 
 	for _, u := range r.Urls {
 		addr, err := url.Parse(u)
 		if err != nil {
-			return fmt.Errorf("Unable to parse address '%s': %s", u, err)
+			acc.AddError(fmt.Errorf("Unable to parse address '%s': %s", u, err))
+			continue
 		}
 
 		wg.Add(1)
 		go func(addr *url.URL) {
 			defer wg.Done()
-			outerr = r.gatherUrl(addr, acc)
+			acc.AddError(r.gatherUrl(addr, acc))
 		}(addr)
 	}
 
 	wg.Wait()
 
-	return outerr
+	return nil
 }
 
 func (r *Raindrops) gatherUrl(addr *url.URL, acc telegraf.Accumulator) error {

plugins/inputs/raindrops/raindrops_test.go

@@ -68,7 +68,7 @@ func TestRaindropsGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := n.Gather(&acc)
+	err := acc.GatherError(n.Gather)
 	require.NoError(t, err)
 
 	fields := map[string]interface{}{

plugins/inputs/redis/redis.go

@@ -12,7 +12,6 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
-	"github.com/influxdata/telegraf/internal/errchan"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -66,7 +65,6 @@ func (r *Redis) Gather(acc telegraf.Accumulator) error {
 	}
 
 	var wg sync.WaitGroup
-	errChan := errchan.New(len(r.Servers))
 	for _, serv := range r.Servers {
 		if !strings.HasPrefix(serv, "tcp://") && !strings.HasPrefix(serv, "unix://") {
 			serv = "tcp://" + serv
@@ -74,7 +72,8 @@ func (r *Redis) Gather(acc telegraf.Accumulator) error {
 
 		u, err := url.Parse(serv)
 		if err != nil {
-			return fmt.Errorf("Unable to parse to address '%s': %s", serv, err)
+			acc.AddError(fmt.Errorf("Unable to parse to address '%s': %s", serv, err))
+			continue
 		} else if u.Scheme == "" {
 			// fallback to simple string based address (i.e. "10.0.0.1:10000")
 			u.Scheme = "tcp"
@@ -91,12 +90,12 @@ func (r *Redis) Gather(acc telegraf.Accumulator) error {
 		wg.Add(1)
 		go func(serv string) {
 			defer wg.Done()
-			errChan.C <- r.gatherServer(u, acc)
+			acc.AddError(r.gatherServer(u, acc))
 		}(serv)
 	}
 
 	wg.Wait()
-	return errChan.Error()
+	return nil
 }
 
 func (r *Redis) gatherServer(addr *url.URL, acc telegraf.Accumulator) error {

plugins/inputs/redis/redis_test.go

@@ -25,7 +25,7 @@ func TestRedisConnect(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := r.Gather(&acc)
+	err := acc.GatherError(r.Gather)
 	require.NoError(t, err)
 }
 

plugins/inputs/rethinkdb/rethinkdb.go

@@ -44,12 +44,11 @@ func (r *RethinkDB) Gather(acc telegraf.Accumulator) error {
 
 	var wg sync.WaitGroup
 
-	var outerr error
-
 	for _, serv := range r.Servers {
 		u, err := url.Parse(serv)
 		if err != nil {
-			return fmt.Errorf("Unable to parse to address '%s': %s", serv, err)
+			acc.AddError(fmt.Errorf("Unable to parse to address '%s': %s", serv, err))
+			continue
 		} else if u.Scheme == "" {
 			// fallback to simple string based address (i.e. "10.0.0.1:10000")
 			u.Host = serv
@@ -57,13 +56,13 @@ func (r *RethinkDB) Gather(acc telegraf.Accumulator) error {
 		wg.Add(1)
 		go func(serv string) {
 			defer wg.Done()
-			outerr = r.gatherServer(&Server{Url: u}, acc)
+			acc.AddError(r.gatherServer(&Server{Url: u}, acc))
 		}(serv)
 	}
 
 	wg.Wait()
 
-	return outerr
+	return nil
 }
 
 func (r *RethinkDB) gatherServer(server *Server, acc telegraf.Accumulator) error {

plugins/inputs/riak/riak.go

@@ -104,9 +104,7 @@ func (r *Riak) Gather(acc telegraf.Accumulator) error {
 
 	// Range over all servers, gathering stats. Returns early in case of any error.
 	for _, s := range r.Servers {
-		if err := r.gatherServer(s, acc); err != nil {
+		acc.AddError(r.gatherServer(s, acc))
-			return err
-		}
 	}
 
 	return nil

plugins/inputs/snmp_legacy/snmp_legacy.go

@@ -1,6 +1,7 @@
 package snmp_legacy
 
 import (
+	"fmt"
 	"io/ioutil"
 	"log"
 	"net"
@@ -394,16 +395,16 @@ func (s *Snmp) Gather(acc telegraf.Accumulator) error {
 		// only if len(s.OidInstanceMapping) == 0
 		if len(host.OidInstanceMapping) >= 0 {
 			if err := host.SNMPMap(acc, s.nameToOid, s.subTableMap); err != nil {
-				log.Printf("E! SNMP Mapping error for host '%s': %s", host.Address, err)
+				acc.AddError(fmt.Errorf("E! SNMP Mapping error for host '%s': %s", host.Address, err))
 				continue
 			}
 		}
 		// Launch Get requests
 		if err := host.SNMPGet(acc, s.initNode); err != nil {
-			log.Printf("E! SNMP Error for host '%s': %s", host.Address, err)
+			acc.AddError(fmt.Errorf("E! SNMP Error for host '%s': %s", host.Address, err))
 		}
 		if err := host.SNMPBulk(acc, s.initNode); err != nil {
-			log.Printf("E! SNMP Error for host '%s': %s", host.Address, err)
+			acc.AddError(fmt.Errorf("E! SNMP Error for host '%s': %s", host.Address, err))
 		}
 	}
 	return nil

plugins/inputs/sqlserver/sqlserver.go

@@ -79,20 +79,19 @@ func (s *SQLServer) Gather(acc telegraf.Accumulator) error {
 	}
 
 	var wg sync.WaitGroup
-	var outerr error
 
 	for _, serv := range s.Servers {
 		for _, query := range queries {
 			wg.Add(1)
 			go func(serv string, query Query) {
 				defer wg.Done()
-				outerr = s.gatherServer(serv, query, acc)
+				acc.AddError(s.gatherServer(serv, query, acc))
 			}(serv, query)
 		}
 	}
 
 	wg.Wait()
-	return outerr
+	return nil
 }
 
 func (s *SQLServer) gatherServer(server string, query Query, acc telegraf.Accumulator) error {

plugins/inputs/sysstat/sysstat.go

@@ -5,7 +5,6 @@ package sysstat
 import (
 	"bufio"
 	"encoding/csv"
-	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -149,34 +148,20 @@ func (s *Sysstat) Gather(acc telegraf.Accumulator) error {
 		return err
 	}
 	var wg sync.WaitGroup
-	errorChannel := make(chan error, len(s.Options)*2)
 	for option := range s.Options {
 		wg.Add(1)
 		go func(acc telegraf.Accumulator, option string) {
 			defer wg.Done()
-			if err := s.parse(acc, option, ts); err != nil {
+			acc.AddError(s.parse(acc, option, ts))
-				errorChannel <- err
-			}
 		}(acc, option)
 	}
 	wg.Wait()
-	close(errorChannel)
-
-	errorStrings := []string{}
-	for err := range errorChannel {
-		errorStrings = append(errorStrings, err.Error())
-	}
 
 	if _, err := os.Stat(s.tmpFile); err == nil {
-		if err := os.Remove(s.tmpFile); err != nil {
+		acc.AddError(os.Remove(s.tmpFile))
-			errorStrings = append(errorStrings, err.Error())
-		}
 	}
 
-	if len(errorStrings) == 0 {
+	return nil
-		return nil
-	}
-	return errors.New(strings.Join(errorStrings, "\n"))
 }
 
 // collect collects sysstat data with the collector utility sadc.

plugins/inputs/sysstat/sysstat_interval_test.go

@@ -26,14 +26,14 @@ func TestInterval(t *testing.T) {
 	s.interval = 0
 	wantedInterval := 3
 
-	err := s.Gather(&acc)
+	err := acc.GatherError(s.Gather)
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	time.Sleep(time.Duration(wantedInterval) * time.Second)
 
-	err = s.Gather(&acc)
+	err = acc.GatherError(s.Gather)
 	if err != nil {
 		t.Fatal(err)
 	}

plugins/inputs/sysstat/sysstat_test.go

@@ -37,7 +37,7 @@ func TestGather(t *testing.T) {
 	defer func() { execCommand = exec.Command }()
 	var acc testutil.Accumulator
 
-	err := s.Gather(&acc)
+	err := acc.GatherError(s.Gather)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -160,7 +160,7 @@ func TestGatherGrouped(t *testing.T) {
 	defer func() { execCommand = exec.Command }()
 	var acc testutil.Accumulator
 
-	err := s.Gather(&acc)
+	err := acc.GatherError(s.Gather)
 	if err != nil {
 		t.Fatal(err)
 	}

plugins/inputs/tail/tail.go

@@ -80,7 +80,6 @@ func (t *Tail) Start(acc telegraf.Accumulator) error {
 		}
 	}
 
-	var errS string
 	// Create a "tailer" for each file
 	for _, filepath := range t.Files {
 		g, err := globpath.Compile(filepath)
@@ -97,7 +96,7 @@ func (t *Tail) Start(acc telegraf.Accumulator) error {
 					Pipe:      t.Pipe,
 				})
 			if err != nil {
-				errS += err.Error() + " "
+				acc.AddError(err)
 				continue
 			}
 			// create a goroutine for each "tailer"
@@ -107,9 +106,6 @@ func (t *Tail) Start(acc telegraf.Accumulator) error {
 		}
 	}
 
-	if errS != "" {
-		return fmt.Errorf(errS)
-	}
 	return nil
 }
 

plugins/inputs/tail/tail_test.go

@@ -30,7 +30,7 @@ func TestTailFromBeginning(t *testing.T) {
 
 	acc := testutil.Accumulator{}
 	require.NoError(t, tt.Start(&acc))
-	require.NoError(t, tt.Gather(&acc))
+	require.NoError(t, acc.GatherError(tt.Gather))
 
 	acc.Wait(1)
 	acc.AssertContainsTaggedFields(t, "cpu",
@@ -67,7 +67,7 @@ func TestTailFromEnd(t *testing.T) {
 
 	_, err = tmpfile.WriteString("cpu,othertag=foo usage_idle=100\n")
 	require.NoError(t, err)
-	require.NoError(t, tt.Gather(&acc))
+	require.NoError(t, acc.GatherError(tt.Gather))
 
 	acc.Wait(1)
 	acc.AssertContainsTaggedFields(t, "cpu",
@@ -98,7 +98,7 @@ func TestTailBadLine(t *testing.T) {
 
 	_, err = tmpfile.WriteString("cpu mytag= foo usage_idle= 100\n")
 	require.NoError(t, err)
-	require.NoError(t, tt.Gather(&acc))
+	require.NoError(t, acc.GatherError(tt.Gather))
 
 	acc.WaitError(1)
 	assert.Contains(t, acc.Errors[0].Error(), "E! Malformed log line")

plugins/inputs/varnish/varnish.go

@@ -6,7 +6,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"os"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -124,8 +123,8 @@ func (s *Varnish) Gather(acc telegraf.Accumulator) error {
 
 		sectionMap[section][field], err = strconv.ParseUint(value, 10, 64)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "Expected a numeric value for %s = %v\n",
+			acc.AddError(fmt.Errorf("Expected a numeric value for %s = %v\n",
-				stat, value)
+				stat, value))
 		}
 	}
 

plugins/inputs/webhooks/webhooks.go

@@ -79,7 +79,7 @@ func (wb *Webhooks) Listen(acc telegraf.Accumulator) {
 
 	err := http.ListenAndServe(fmt.Sprintf("%s", wb.ServiceAddress), r)
 	if err != nil {
-		log.Printf("E! Error starting server: %v", err)
+		acc.AddError(fmt.Errorf("E! Error starting server: %v", err))
 	}
 }
 

plugins/inputs/zookeeper/zookeeper.go

@@ -47,9 +47,7 @@ func (z *Zookeeper) Gather(acc telegraf.Accumulator) error {
 	}
 
 	for _, serverAddress := range z.Servers {
-		if err := z.gatherServer(serverAddress, acc); err != nil {
+		acc.AddError(z.gatherServer(serverAddress, acc))
-			return err
-		}
 	}
 	return nil
 }

plugins/inputs/zookeeper/zookeeper_test.go

@@ -19,8 +19,7 @@ func TestZookeeperGeneratesMetrics(t *testing.T) {
 
 	var acc testutil.Accumulator
 
-	err := z.Gather(&acc)
+	require.NoError(t, acc.GatherError(z.Gather))
-	require.NoError(t, err)
 
 	intMetrics := []string{
 		"avg_latency",

testutil/accumulator.go

@@ -187,6 +187,17 @@ func (a *Accumulator) TagValue(measurement string, key string) string {
 	return ""
 }
 
+// Calls the given Gather function and returns the first error found.
+func (a *Accumulator) GatherError(gf func(telegraf.Accumulator) error) error {
+	if err := gf(a); err != nil {
+		return err
+	}
+	if len(a.Errors) > 0 {
+		return a.Errors[0]
+	}
+	return nil
+}
+
 // NFields returns the total number of fields in the accumulator, across all
 // measurements
 func (a *Accumulator) NFields() int {