Update win_perf_counters README

(cherry picked from commit 76ec90e66d)

Godeps

@@ -32,7 +32,7 @@ github.com/go-redis/redis 73b70592cdaa9e6abdfcfbf97b4a90d80728c836
 github.com/go-sql-driver/mysql 2e00b5cd70399450106cec6431c2e2ce3cae5034
 github.com/hailocab/go-hostpool e80d13ce29ede4452c43dea11e79b9bc8a15b478
 github.com/hashicorp/consul 5174058f0d2bda63fa5198ab96c33d9a909c58ed
-github.com/influxdata/go-syslog 84f3b60009444d298f97454feb1f20cf91d1fa6e
+github.com/influxdata/go-syslog eecd51df3ad85464a2bab9b7d3a45bc1e299059e
 github.com/influxdata/tail c43482518d410361b6c383d7aebce33d0471d7bc
 github.com/influxdata/toml 2a2e3012f7cfbef64091cc79776311e65dfa211b
 github.com/influxdata/wlog 7c63b0a71ef8300adc255344d275e10e5c3a71ec

plugins/inputs/win_perf_counters/README.md

@@ -8,9 +8,6 @@ whether the Object, Instance and Counter exist on Telegraf startup.
 Counter paths are refreshed periodically, see [CountersRefreshInterval](#countersrefreshinterval)
 configuration parameter for more info.
 
-Wildcards can be used in instance and counter names. Partial wildcards are supported only
-in instance names on Windows Vista and newer.
-
 In case of query for all instances `["*"]`, the plugin does not return the instance `_Total`
 by default. See [IncludeTotal](#includetotal) for more info.
 
@@ -34,18 +31,36 @@ Bool, if set to `true` will print out all matching performance objects.
 Example:
 `PrintValid=true`
 
+#### UseWildcardsExpansion
+
+If `UseWildcardsExpansion` is set to true, wildcards can be used in the
+instance name and the counter name.  When using localized Windows, counters
+will be also be localized.  Instance indexes will also be returned in the
+instance name.
+
+Partial wildcards (e.g. `chrome*`) are supported only in the instance name on Windows Vista and newer.
+
+If disabled, wildcards (not partial) in instance names can still be used, but
+instance indexes will not be returned in the instance names.
+
+Example:
+`UseWildcardsExpansion=true`
+
 #### CountersRefreshInterval
 
 Configured counters are matched against available counters at the interval
 specified by the `CountersRefreshInterval` parameter. Default value is `1m` (1 minute).
 
-If wildcards are used in instance or counter names, they are expanded at this point.
+If wildcards are used in instance or counter names, they are expanded at this point, if the `UseWildcardsExpansion` param is set to `true`.
 
 Setting `CountersRefreshInterval` too low (order of seconds) can cause Telegraf to create
 a high CPU load.
 
 Set to `0s` to disable periodic refreshing.
 
+Example:
+`CountersRefreshInterval=1m`
+
 #### PreVistaSupport
 
 _Deprecated. Necessary features on Windows Vista and newer are checked dynamically_
@@ -88,7 +103,7 @@ By default any results containing `_Total` are stripped,
 unless this is specified as the wanted instance.
 Alternatively see the option `IncludeTotal` below.
 
-It is also possible to set partial wildcards, eg. `["chrome*"]`
+It is also possible to set partial wildcards, eg. `["chrome*"]`, if the `UseWildcardsExpansion` param is set to `true`
 
 Some Objects do not have instances to select from at all.
 Here only one option is valid if you want data back,
@@ -101,8 +116,10 @@ Counters key (this is an array) is the counters of the ObjectName
 you would like returned, it can also be one or more values.
 
 Example: `Counters = ["% Idle Time", "% Disk Read Time", "% Disk Write Time"]`
-This must be specified for every counter you want the results of,
-or use `["*"]` for all the counters for object.
+
+This must be specified for every counter you want the results of, or use
+`["*"]` for all the counters for object, if the `UseWildcardsExpansion` param
+is set to `true`
 
 #### Measurement
 *Optional*

plugins/inputs/win_perf_counters/pdh.go

@@ -352,7 +352,7 @@ func PdhGetFormattedCounterValueDouble(hCounter PDH_HCOUNTER, lpdwType *uint32,
 //			time.Sleep(2000 * time.Millisecond)
 //		}
 //	}
-func PdhGetFormattedCounterArrayDouble(hCounter PDH_HCOUNTER, lpdwBufferSize *uint32, lpdwBufferCount *uint32, itemBuffer *PDH_FMT_COUNTERVALUE_ITEM_DOUBLE) uint32 {
+func PdhGetFormattedCounterArrayDouble(hCounter PDH_HCOUNTER, lpdwBufferSize *uint32, lpdwBufferCount *uint32, itemBuffer *byte) uint32 {
 	ret, _, _ := pdh_GetFormattedCounterArrayW.Call(
 		uintptr(hCounter),
 		uintptr(PDH_FMT_DOUBLE|PDH_FMT_NOCAP100),

plugins/inputs/win_perf_counters/performance_query.go

@@ -9,6 +9,12 @@ import (
 	"unsafe"
 )
 
+//PerformanceQuery is abstraction for PDH_FMT_COUNTERVALUE_ITEM_DOUBLE
+type CounterValue struct {
+	InstanceName string
+	Value        float64
+}
+
 //PerformanceQuery provides wrappers around Windows performance counters API for easy usage in GO
 type PerformanceQuery interface {
 	Open() error
@@ -18,6 +24,7 @@ type PerformanceQuery interface {
 	GetCounterPath(counterHandle PDH_HCOUNTER) (string, error)
 	ExpandWildCardPath(counterPath string) ([]string, error)
 	GetFormattedCounterValueDouble(hCounter PDH_HCOUNTER) (float64, error)
+	GetFormattedCounterArrayDouble(hCounter PDH_HCOUNTER) ([]CounterValue, error)
 	CollectData() error
 	AddEnglishCounterSupported() bool
 }
@@ -151,6 +158,28 @@ func (m *PerformanceQueryImpl) GetFormattedCounterValueDouble(hCounter PDH_HCOUN
 	}
 }
 
+func (m *PerformanceQueryImpl) GetFormattedCounterArrayDouble(hCounter PDH_HCOUNTER) ([]CounterValue, error) {
+	var buffSize uint32
+	var itemCount uint32
+	ret := PdhGetFormattedCounterArrayDouble(hCounter, &buffSize, &itemCount, nil)
+	if ret == PDH_MORE_DATA {
+		buff := make([]byte, buffSize)
+		ret = PdhGetFormattedCounterArrayDouble(hCounter, &buffSize, &itemCount, &buff[0])
+		if ret == ERROR_SUCCESS {
+			items := (*[1 << 20]PDH_FMT_COUNTERVALUE_ITEM_DOUBLE)(unsafe.Pointer(&buff[0]))[:itemCount]
+			values := make([]CounterValue, 0, itemCount)
+			for _, item := range items {
+				if item.FmtValue.CStatus == PDH_CSTATUS_VALID_DATA || item.FmtValue.CStatus == PDH_CSTATUS_NEW_DATA {
+					val := CounterValue{UTF16PtrToString(item.SzName), item.FmtValue.DoubleValue}
+					values = append(values, val)
+				}
+			}
+			return values, nil
+		}
+	}
+	return nil, NewPdhError(ret)
+}
+
 func (m *PerformanceQueryImpl) CollectData() error {
 	if m.query == 0 {
 		return errors.New("uninitialised query")
@@ -181,7 +210,7 @@ func UTF16ToStringArray(buf []uint16) []string {
 	stringLine := UTF16PtrToString(&buf[0])
 	for stringLine != "" {
 		strings = append(strings, stringLine)
-		nextLineStart += len(stringLine) + 1
+		nextLineStart += len([]rune(stringLine)) + 1
 		remainingBuf := buf[nextLineStart:]
 		stringLine = UTF16PtrToString(&remainingBuf[0])
 	}

plugins/inputs/win_perf_counters/win_perf_counters.go

@@ -22,6 +22,10 @@ var sampleConfig = `
   ## agent, it will not be gathered.
   ## Settings:
   # PrintValid = false # Print All matching performance counters
+  # If UseWildcardsExpansion params is set to true, wildcards (partial wildcards in instance names and wildcards in counters names) in configured counter paths will be expanded 
+  # and in case of localized Windows, counter paths will be also localized. It also returns instance indexes in instance names.
+  # If false, wildcards (not partial) in instance names will be still expanded, but instance indexes will not be returned in instance names.
+  #UseWildcardsExpansion = false
   # Period after which counters will be reread from configuration and wildcards in counter paths expanded
   CountersRefreshInterval="1m"
 
@@ -75,6 +79,7 @@ type Win_PerfCounters struct {
 	PreVistaSupport         bool
 	Object                  []perfobject
 	CountersRefreshInterval internal.Duration
+	UseWildcardsExpansion   bool
 
 	lastRefreshed time.Time
 	counters      []*counter
@@ -137,45 +142,59 @@ func (m *Win_PerfCounters) SampleConfig() string {
 	return sampleConfig
 }
 
-func (m *Win_PerfCounters) AddItem(counterPath string, instance string, measurement string, includeTotal bool) error {
+//objectName string, counter string, instance string, measurement string, include_total bool
+func (m *Win_PerfCounters) AddItem(counterPath string, objectName string, instance string, counterName string, measurement string, includeTotal bool) error {
+	var err error
+	var counterHandle PDH_HCOUNTER
 	if !m.query.AddEnglishCounterSupported() {
-		_, err := m.query.AddCounterToQuery(counterPath)
+		counterHandle, err = m.query.AddCounterToQuery(counterPath)
 		if err != nil {
 			return err
 		}
 	} else {
-		counterHandle, err := m.query.AddEnglishCounterToQuery(counterPath)
+		counterHandle, err = m.query.AddEnglishCounterToQuery(counterPath)
 		if err != nil {
 			return err
 		}
+
+	}
+
+	if m.UseWildcardsExpansion {
+		origInstance := instance
 		counterPath, err = m.query.GetCounterPath(counterHandle)
 		if err != nil {
 			return err
 		}
-	}
-
-	counters, err := m.query.ExpandWildCardPath(counterPath)
-	if err != nil {
-		return err
-	}
-
-	for _, counterPath := range counters {
-		var err error
-		counterHandle, err := m.query.AddCounterToQuery(counterPath)
-
-		parsedObjectName, parsedInstance, parsedCounter, err := extractObjectInstanceCounterFromQuery(counterPath)
+		counters, err := m.query.ExpandWildCardPath(counterPath)
 		if err != nil {
 			return err
 		}
 
-		if parsedInstance == "_Total" && instance == "*" && !includeTotal {
-			continue
-		}
+		for _, counterPath := range counters {
+			var err error
+			counterHandle, err := m.query.AddCounterToQuery(counterPath)
 
-		newItem := &counter{counterPath, parsedObjectName, parsedCounter, parsedInstance, measurement,
+			objectName, instance, counterName, err = extractObjectInstanceCounterFromQuery(counterPath)
+			if err != nil {
+				return err
+			}
+
+			if instance == "_Total" && origInstance == "*" && !includeTotal {
+				continue
+			}
+
+			newItem := &counter{counterPath, objectName, counterName, instance, measurement,
+				includeTotal, counterHandle}
+			m.counters = append(m.counters, newItem)
+
+			if m.PrintValid {
+				log.Printf("Valid: %s\n", counterPath)
+			}
+		}
+	} else {
+		newItem := &counter{counterPath, objectName, counterName, instance, measurement,
 			includeTotal, counterHandle}
 		m.counters = append(m.counters, newItem)
-
 		if m.PrintValid {
 			log.Printf("Valid: %s\n", counterPath)
 		}
@@ -199,7 +218,7 @@ func (m *Win_PerfCounters) ParseConfig() error {
 						counterPath = "\\" + objectname + "(" + instance + ")\\" + counter
 					}
 
-					err := m.AddItem(counterPath, instance, PerfObject.Measurement, PerfObject.IncludeTotal)
+					err := m.AddItem(counterPath, objectname, instance, counter, PerfObject.Measurement, PerfObject.IncludeTotal)
 
 					if err != nil {
 						if PerfObject.FailOnMissing || PerfObject.WarnOnMissing {
@@ -225,7 +244,9 @@ func (m *Win_PerfCounters) Gather(acc telegraf.Accumulator) error {
 	var err error
 
 	if m.lastRefreshed.IsZero() || (m.CountersRefreshInterval.Duration.Nanoseconds() > 0 && m.lastRefreshed.Add(m.CountersRefreshInterval.Duration).Before(time.Now())) {
-		m.counters = m.counters[:0]
+		if m.counters != nil {
+			m.counters = m.counters[:0]
+		}
 
 		err = m.query.Open()
 		if err != nil {
@@ -261,22 +282,61 @@ func (m *Win_PerfCounters) Gather(acc telegraf.Accumulator) error {
 	// For iterate over the known metrics and get the samples.
 	for _, metric := range m.counters {
 		// collect
-		value, err := m.query.GetFormattedCounterValueDouble(metric.counterHandle)
-		if err == nil {
-			measurement := sanitizedChars.Replace(metric.measurement)
-			if measurement == "" {
-				measurement = "win_perf_counters"
-			}
+		if m.UseWildcardsExpansion {
+			value, err := m.query.GetFormattedCounterValueDouble(metric.counterHandle)
+			if err == nil {
+				measurement := sanitizedChars.Replace(metric.measurement)
+				if measurement == "" {
+					measurement = "win_perf_counters"
+				}
 
-			var instance = InstanceGrouping{measurement, metric.instance, metric.objectName}
-			if collectFields[instance] == nil {
-				collectFields[instance] = make(map[string]interface{})
+				var instance = InstanceGrouping{measurement, metric.instance, metric.objectName}
+				if collectFields[instance] == nil {
+					collectFields[instance] = make(map[string]interface{})
+				}
+				collectFields[instance][sanitizedChars.Replace(metric.counter)] = float32(value)
+			} else {
+				//ignore invalid data from as some counters from process instances returns this sometimes
+				if phderr, ok := err.(*PdhError); ok && phderr.ErrorCode != PDH_INVALID_DATA && phderr.ErrorCode != PDH_CALC_NEGATIVE_VALUE {
+					return fmt.Errorf("error while getting value for counter %s: %v", metric.counterPath, err)
+				}
 			}
-			collectFields[instance][sanitizedChars.Replace(metric.counter)] = float32(value)
 		} else {
-			//ignore invalid data from as some counters from process instances returns this sometimes
-			if phderr, ok := err.(*PdhError); ok && phderr.ErrorCode != PDH_INVALID_DATA && phderr.ErrorCode != PDH_CALC_NEGATIVE_VALUE {
-				return fmt.Errorf("error while getting value for counter %s: %v", metric.counterPath, err)
+			counterValues, err := m.query.GetFormattedCounterArrayDouble(metric.counterHandle)
+			if err == nil {
+				for _, cValue := range counterValues {
+					var add bool
+					if metric.includeTotal {
+						// If IncludeTotal is set, include all.
+						add = true
+					} else if metric.instance == "*" && !strings.Contains(cValue.InstanceName, "_Total") {
+						// Catch if set to * and that it is not a '*_Total*' instance.
+						add = true
+					} else if metric.instance == cValue.InstanceName {
+						// Catch if we set it to total or some form of it
+						add = true
+					} else if strings.Contains(metric.instance, "#") && strings.HasPrefix(metric.instance, cValue.InstanceName) {
+						// If you are using a multiple instance identifier such as "w3wp#1"
+						// phd.dll returns only the first 2 characters of the identifier.
+						add = true
+						cValue.InstanceName = metric.instance
+					} else if metric.instance == "------" {
+						add = true
+					}
+
+					if add {
+						measurement := sanitizedChars.Replace(metric.measurement)
+						if measurement == "" {
+							measurement = "win_perf_counters"
+						}
+						var instance = InstanceGrouping{measurement, cValue.InstanceName, metric.objectName}
+
+						if collectFields[instance] == nil {
+							collectFields[instance] = make(map[string]interface{})
+						}
+						collectFields[instance][sanitizedChars.Replace(metric.counter)] = float32(cValue.Value)
+					}
+				}
 			}
 		}
 	}

plugins/inputs/win_perf_counters/win_perf_counters_integration_test.go

@@ -81,6 +81,29 @@ func TestWinPerformanceQueryImpl(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, paths)
 	assert.True(t, len(paths) > 1)
+
+	err = query.Open()
+	require.NoError(t, err)
+
+	counterPath = "\\Process(*)\\% Processor Time"
+	hCounter, err = query.AddEnglishCounterToQuery(counterPath)
+	require.NoError(t, err)
+	assert.NotEqual(t, 0, hCounter)
+
+	err = query.CollectData()
+	require.NoError(t, err)
+	time.Sleep(time.Second)
+
+	err = query.CollectData()
+	require.NoError(t, err)
+
+	arr, err := query.GetFormattedCounterArrayDouble(hCounter)
+	require.NoError(t, err)
+	assert.True(t, len(arr) > 0, "Too")
+
+	err = query.Close()
+	require.NoError(t, err)
+
 }
 
 func TestWinPerfcountersConfigGet1(t *testing.T) {
@@ -573,7 +596,7 @@ func TestWinPerfcountersCollect2(t *testing.T) {
 
 	perfobjects[0] = PerfObject
 
-	m := Win_PerfCounters{PrintValid: false, Object: perfobjects, query: &PerformanceQueryImpl{}}
+	m := Win_PerfCounters{PrintValid: false, Object: perfobjects, query: &PerformanceQueryImpl{}, UseWildcardsExpansion: true}
 	var acc testutil.Accumulator
 	err := m.Gather(&acc)
 	require.NoError(t, err)

plugins/inputs/win_perf_counters/win_perf_counters_test.go

@@ -25,6 +25,14 @@ type FakePerformanceQuery struct {
 	openCalled          bool
 }
 
+func (m *testCounter) ToCounterValue() *CounterValue {
+	_, inst, _, _ := extractObjectInstanceCounterFromQuery(m.path)
+	if inst == "" {
+		inst = "--"
+	}
+	return &CounterValue{inst, m.value}
+}
+
 func (m *FakePerformanceQuery) Open() error {
 	if m.openCalled {
 		err := m.Close()
@@ -102,6 +110,48 @@ func (m *FakePerformanceQuery) GetFormattedCounterValueDouble(counterHandle PDH_
 	}
 	return 0, fmt.Errorf("GetFormattedCounterValueDouble: invalid handle: %d", counterHandle)
 }
+func (m *FakePerformanceQuery) findCounterByPath(counterPath string) *testCounter {
+	for _, c := range m.counters {
+		if c.path == counterPath {
+			return &c
+		}
+	}
+	return nil
+}
+
+func (m *FakePerformanceQuery) findCounterByHandle(counterHandle PDH_HCOUNTER) *testCounter {
+	for _, c := range m.counters {
+		if c.handle == counterHandle {
+			return &c
+		}
+	}
+	return nil
+}
+
+func (m *FakePerformanceQuery) GetFormattedCounterArrayDouble(hCounter PDH_HCOUNTER) ([]CounterValue, error) {
+	if !m.openCalled {
+		return nil, errors.New("GetFormattedCounterArrayDouble: uninitialised query")
+	}
+	for _, c := range m.counters {
+		if c.handle == hCounter {
+			if e, ok := m.expandPaths[c.path]; ok {
+				counters := make([]CounterValue, 0, len(e))
+				for _, p := range e {
+					counter := m.findCounterByPath(p)
+					if counter != nil && counter.value > 0 {
+						counters = append(counters, *counter.ToCounterValue())
+					} else {
+						return nil, fmt.Errorf("GetFormattedCounterArrayDouble: invalid counter : %s", p)
+					}
+				}
+				return counters, nil
+			} else {
+				return nil, fmt.Errorf("GetFormattedCounterArrayDouble: invalid counter : %d", hCounter)
+			}
+		}
+	}
+	return nil, fmt.Errorf("GetFormattedCounterArrayDouble: invalid counter : %d, no paths found", hCounter)
+}
 
 func (m *FakePerformanceQuery) CollectData() error {
 	if !m.openCalled {
@@ -152,7 +202,7 @@ func TestAddItemSimple(t *testing.T) {
 	}}
 	err = m.query.Open()
 	require.NoError(t, err)
-	err = m.AddItem(cps1[0], "I", "test", false)
+	err = m.AddItem(cps1[0], "O", "I", "c", "test", false)
 	require.NoError(t, err)
 	err = m.query.Close()
 	require.NoError(t, err)
@@ -161,7 +211,7 @@ func TestAddItemSimple(t *testing.T) {
 func TestAddItemInvalidCountPath(t *testing.T) {
 	var err error
 	cps1 := []string{"\\O\\C"}
-	m := Win_PerfCounters{PrintValid: false, Object: nil, query: &FakePerformanceQuery{
+	m := Win_PerfCounters{PrintValid: false, Object: nil, UseWildcardsExpansion: true, query: &FakePerformanceQuery{
 		counters: createCounterMap(cps1, []float64{1.1}),
 		expandPaths: map[string][]string{
 			cps1[0]: {"\\O/C"},
@@ -170,7 +220,7 @@ func TestAddItemInvalidCountPath(t *testing.T) {
 	}}
 	err = m.query.Open()
 	require.NoError(t, err)
-	err = m.AddItem("\\O\\C", "*", "test", false)
+	err = m.AddItem("\\O\\C", "O", "------", "C", "test", false)
 	require.Error(t, err)
 	err = m.query.Close()
 	require.NoError(t, err)
@@ -197,13 +247,24 @@ func TestParseConfigBasic(t *testing.T) {
 	assert.Len(t, m.counters, 4)
 	err = m.query.Close()
 	require.NoError(t, err)
+
+	m.UseWildcardsExpansion = true
+	m.counters = nil
+
+	err = m.query.Open()
+	require.NoError(t, err)
+	err = m.ParseConfig()
+	require.NoError(t, err)
+	assert.Len(t, m.counters, 4)
+	err = m.query.Close()
+	require.NoError(t, err)
 }
 
 func TestParseConfigNoInstance(t *testing.T) {
 	var err error
 	perfObjects := createPerfObject("m", "O", []string{"------"}, []string{"C1", "C2"}, false, false)
 	cps1 := []string{"\\O\\C1", "\\O\\C2"}
-	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, query: &FakePerformanceQuery{
+	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, UseWildcardsExpansion: false, query: &FakePerformanceQuery{
 		counters: createCounterMap(cps1, []float64{1.1, 1.2}),
 		expandPaths: map[string][]string{
 			cps1[0]: {cps1[0]},
@@ -218,6 +279,17 @@ func TestParseConfigNoInstance(t *testing.T) {
 	assert.Len(t, m.counters, 2)
 	err = m.query.Close()
 	require.NoError(t, err)
+
+	m.UseWildcardsExpansion = true
+	m.counters = nil
+
+	err = m.query.Open()
+	require.NoError(t, err)
+	err = m.ParseConfig()
+	require.NoError(t, err)
+	assert.Len(t, m.counters, 2)
+	err = m.query.Close()
+	require.NoError(t, err)
 }
 
 func TestParseConfigInvalidCounterError(t *testing.T) {
@@ -239,6 +311,16 @@ func TestParseConfigInvalidCounterError(t *testing.T) {
 	require.Error(t, err)
 	err = m.query.Close()
 	require.NoError(t, err)
+
+	m.UseWildcardsExpansion = true
+	m.counters = nil
+
+	err = m.query.Open()
+	require.NoError(t, err)
+	err = m.ParseConfig()
+	require.Error(t, err)
+	err = m.query.Close()
+	require.NoError(t, err)
 }
 
 func TestParseConfigInvalidCounterNoError(t *testing.T) {
@@ -260,13 +342,24 @@ func TestParseConfigInvalidCounterNoError(t *testing.T) {
 	require.NoError(t, err)
 	err = m.query.Close()
 	require.NoError(t, err)
+
+	m.UseWildcardsExpansion = true
+	m.counters = nil
+
+	err = m.query.Open()
+	require.NoError(t, err)
+	err = m.ParseConfig()
+	require.NoError(t, err)
+	err = m.query.Close()
+	require.NoError(t, err)
+
 }
 
-func TestParseConfigTotal(t *testing.T) {
+func TestParseConfigTotalExpansion(t *testing.T) {
 	var err error
 	perfObjects := createPerfObject("m", "O", []string{"*"}, []string{"*"}, true, true)
 	cps1 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(_Total)\\C1", "\\O(_Total)\\C2"}
-	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, query: &FakePerformanceQuery{
+	m := Win_PerfCounters{PrintValid: false, UseWildcardsExpansion: true, Object: perfObjects, query: &FakePerformanceQuery{
 		counters: createCounterMap(append(cps1, "\\O(*)\\*"), []float64{1.1, 1.2, 1.3, 1.4, 0}),
 		expandPaths: map[string][]string{
 			"\\O(*)\\*": cps1,
@@ -283,7 +376,7 @@ func TestParseConfigTotal(t *testing.T) {
 
 	perfObjects[0].IncludeTotal = false
 
-	m = Win_PerfCounters{PrintValid: false, Object: perfObjects, query: &FakePerformanceQuery{
+	m = Win_PerfCounters{PrintValid: false, UseWildcardsExpansion: true, Object: perfObjects, query: &FakePerformanceQuery{
 		counters: createCounterMap(append(cps1, "\\O(*)\\*"), []float64{1.1, 1.2, 1.3, 1.4, 0}),
 		expandPaths: map[string][]string{
 			"\\O(*)\\*": cps1,
@@ -303,7 +396,7 @@ func TestParseConfigExpand(t *testing.T) {
 	var err error
 	perfObjects := createPerfObject("m", "O", []string{"*"}, []string{"*"}, false, false)
 	cps1 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(I2)\\C1", "\\O(I2)\\C2"}
-	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, query: &FakePerformanceQuery{
+	m := Win_PerfCounters{PrintValid: false, UseWildcardsExpansion: true, Object: perfObjects, query: &FakePerformanceQuery{
 		counters: createCounterMap(append(cps1, "\\O(*)\\*"), []float64{1.1, 1.2, 1.3, 1.4, 0}),
 		expandPaths: map[string][]string{
 			"\\O(*)\\*": cps1,
@@ -346,6 +439,17 @@ func TestSimpleGather(t *testing.T) {
 		"objectname": "O",
 	}
 	acc1.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+
+	m.UseWildcardsExpansion = true
+	m.counters = nil
+	m.lastRefreshed = time.Time{}
+
+	var acc2 testutil.Accumulator
+
+	err = m.Gather(&acc2)
+	require.NoError(t, err)
+	acc1.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+
 }
 
 func TestGatherInvalidDataIgnore(t *testing.T) {
@@ -377,15 +481,25 @@ func TestGatherInvalidDataIgnore(t *testing.T) {
 		"objectname": "O",
 	}
 	acc1.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+
+	m.UseWildcardsExpansion = true
+	m.counters = nil
+	m.lastRefreshed = time.Time{}
+
+	var acc2 testutil.Accumulator
+	err = m.Gather(&acc2)
+	require.NoError(t, err)
+	acc1.AssertContainsTaggedFields(t, measurement, fields1, tags1)
 }
 
-func TestGatherRefreshing(t *testing.T) {
+//tests with expansion
+func TestGatherRefreshingWithExpansion(t *testing.T) {
 	var err error
 	if testing.Short() {
 		t.Skip("Skipping long taking test in short mode")
 	}
 	measurement := "test"
-	perfObjects := createPerfObject(measurement, "O", []string{"*"}, []string{"*"}, false, false)
+	perfObjects := createPerfObject(measurement, "O", []string{"*"}, []string{"*"}, true, false)
 	cps1 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(I2)\\C1", "\\O(I2)\\C2"}
 	fpm := &FakePerformanceQuery{
 		counters: createCounterMap(append(cps1, "\\O(*)\\*"), []float64{1.1, 1.2, 1.3, 1.4, 0}),
@@ -394,7 +508,7 @@ func TestGatherRefreshing(t *testing.T) {
 		},
 		addEnglishSupported: true,
 	}
-	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, query: fpm, CountersRefreshInterval: internal.Duration{Duration: time.Second * 10}}
+	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, UseWildcardsExpansion: true, query: fpm, CountersRefreshInterval: internal.Duration{Duration: time.Second * 10}}
 	var acc1 testutil.Accumulator
 	err = m.Gather(&acc1)
 	assert.Len(t, m.counters, 4)
@@ -463,3 +577,211 @@ func TestGatherRefreshing(t *testing.T) {
 	acc3.AssertContainsTaggedFields(t, measurement, fields3, tags3)
 
 }
+
+func TestGatherRefreshingWithoutExpansion(t *testing.T) {
+	var err error
+	if testing.Short() {
+		t.Skip("Skipping long taking test in short mode")
+	}
+	measurement := "test"
+	perfObjects := createPerfObject(measurement, "O", []string{"*"}, []string{"C1", "C2"}, true, false)
+	cps1 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(I2)\\C1", "\\O(I2)\\C2"}
+	fpm := &FakePerformanceQuery{
+		counters: createCounterMap(append([]string{"\\O(*)\\C1", "\\O(*)\\C2"}, cps1...), []float64{0, 0, 1.1, 1.2, 1.3, 1.4}),
+		expandPaths: map[string][]string{
+			"\\O(*)\\C1": {cps1[0], cps1[2]},
+			"\\O(*)\\C2": {cps1[1], cps1[3]},
+		},
+		addEnglishSupported: true,
+	}
+	m := Win_PerfCounters{PrintValid: false, Object: perfObjects, UseWildcardsExpansion: false, query: fpm, CountersRefreshInterval: internal.Duration{Duration: time.Second * 10}}
+	var acc1 testutil.Accumulator
+	err = m.Gather(&acc1)
+	assert.Len(t, m.counters, 2)
+	require.NoError(t, err)
+	assert.Len(t, acc1.Metrics, 2)
+
+	fields1 := map[string]interface{}{
+		"C1": float32(1.1),
+		"C2": float32(1.2),
+	}
+	tags1 := map[string]string{
+		"instance":   "I1",
+		"objectname": "O",
+	}
+	acc1.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+
+	fields2 := map[string]interface{}{
+		"C1": float32(1.3),
+		"C2": float32(1.4),
+	}
+	tags2 := map[string]string{
+		"instance":   "I2",
+		"objectname": "O",
+	}
+	acc1.AssertContainsTaggedFields(t, measurement, fields2, tags2)
+	//test finding new instance
+	cps2 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(I2)\\C1", "\\O(I2)\\C2", "\\O(I3)\\C1", "\\O(I3)\\C2"}
+	fpm = &FakePerformanceQuery{
+		counters: createCounterMap(append([]string{"\\O(*)\\C1", "\\O(*)\\C2"}, cps2...), []float64{0, 0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6}),
+		expandPaths: map[string][]string{
+			"\\O(*)\\C1": {cps2[0], cps2[2], cps2[4]},
+			"\\O(*)\\C2": {cps2[1], cps2[3], cps2[5]},
+		},
+		addEnglishSupported: true,
+	}
+	m.query = fpm
+	fpm.Open()
+	var acc2 testutil.Accumulator
+
+	fields3 := map[string]interface{}{
+		"C1": float32(1.5),
+		"C2": float32(1.6),
+	}
+	tags3 := map[string]string{
+		"instance":   "I3",
+		"objectname": "O",
+	}
+
+	//test before elapsing CounterRefreshRate counters are not refreshed
+	err = m.Gather(&acc2)
+	require.NoError(t, err)
+	assert.Len(t, m.counters, 2)
+	assert.Len(t, acc2.Metrics, 3)
+
+	acc2.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+	acc2.AssertContainsTaggedFields(t, measurement, fields2, tags2)
+	acc2.AssertContainsTaggedFields(t, measurement, fields3, tags3)
+	//test changed configuration
+	perfObjects = createPerfObject(measurement, "O", []string{"*"}, []string{"C1", "C2", "C3"}, true, false)
+	cps3 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(I1)\\C3", "\\O(I2)\\C1", "\\O(I2)\\C2", "\\O(I2)\\C3"}
+	fpm = &FakePerformanceQuery{
+		counters: createCounterMap(append([]string{"\\O(*)\\C1", "\\O(*)\\C2", "\\O(*)\\C3"}, cps3...), []float64{0, 0, 0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6}),
+		expandPaths: map[string][]string{
+			"\\O(*)\\C1": {cps3[0], cps3[3]},
+			"\\O(*)\\C2": {cps3[1], cps3[4]},
+			"\\O(*)\\C3": {cps3[2], cps3[5]},
+		},
+		addEnglishSupported: true,
+	}
+	m.query = fpm
+	m.Object = perfObjects
+
+	fpm.Open()
+
+	time.Sleep(m.CountersRefreshInterval.Duration)
+
+	var acc3 testutil.Accumulator
+	err = m.Gather(&acc3)
+	require.NoError(t, err)
+	assert.Len(t, acc3.Metrics, 2)
+	fields4 := map[string]interface{}{
+		"C1": float32(1.1),
+		"C2": float32(1.2),
+		"C3": float32(1.3),
+	}
+	tags4 := map[string]string{
+		"instance":   "I1",
+		"objectname": "O",
+	}
+	fields5 := map[string]interface{}{
+		"C1": float32(1.4),
+		"C2": float32(1.5),
+		"C3": float32(1.6),
+	}
+	tags5 := map[string]string{
+		"instance":   "I2",
+		"objectname": "O",
+	}
+
+	acc3.AssertContainsTaggedFields(t, measurement, fields4, tags4)
+	acc3.AssertContainsTaggedFields(t, measurement, fields5, tags5)
+
+}
+
+func TestGatherTotalNoExpansion(t *testing.T) {
+	var err error
+	measurement := "m"
+	perfObjects := createPerfObject(measurement, "O", []string{"*"}, []string{"C1", "C2"}, true, true)
+	cps1 := []string{"\\O(I1)\\C1", "\\O(I1)\\C2", "\\O(_Total)\\C1", "\\O(_Total)\\C2"}
+	m := Win_PerfCounters{PrintValid: false, UseWildcardsExpansion: false, Object: perfObjects, query: &FakePerformanceQuery{
+		counters: createCounterMap(append([]string{"\\O(*)\\C1", "\\O(*)\\C2"}, cps1...), []float64{0, 0, 1.1, 1.2, 1.3, 1.4}),
+		expandPaths: map[string][]string{
+			"\\O(*)\\C1": {cps1[0], cps1[2]},
+			"\\O(*)\\C2": {cps1[1], cps1[3]},
+		},
+		addEnglishSupported: true,
+	}}
+	var acc1 testutil.Accumulator
+	err = m.Gather(&acc1)
+	require.NoError(t, err)
+	assert.Len(t, m.counters, 2)
+	assert.Len(t, acc1.Metrics, 2)
+	fields1 := map[string]interface{}{
+		"C1": float32(1.1),
+		"C2": float32(1.2),
+	}
+	tags1 := map[string]string{
+		"instance":   "I1",
+		"objectname": "O",
+	}
+	acc1.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+
+	fields2 := map[string]interface{}{
+		"C1": float32(1.3),
+		"C2": float32(1.4),
+	}
+	tags2 := map[string]string{
+		"instance":   "_Total",
+		"objectname": "O",
+	}
+	acc1.AssertContainsTaggedFields(t, measurement, fields2, tags2)
+
+	perfObjects[0].IncludeTotal = false
+
+	m.counters = nil
+	m.lastRefreshed = time.Time{}
+
+	var acc2 testutil.Accumulator
+	err = m.Gather(&acc2)
+	require.NoError(t, err)
+	assert.Len(t, m.counters, 2)
+	assert.Len(t, acc2.Metrics, 1)
+
+	acc2.AssertContainsTaggedFields(t, measurement, fields1, tags1)
+
+	acc2.AssertDoesNotContainsTaggedFields(t, measurement, fields2, tags2)
+}
+
+// list of nul terminated strings from WinAPI
+var unicodeStringListWithEnglishChars = []uint16{0x5c, 0x5c, 0x54, 0x34, 0x38, 0x30, 0x5c, 0x50, 0x68, 0x79, 0x73, 0x69, 0x63, 0x61, 0x6c, 0x44, 0x69, 0x73, 0x6b, 0x28, 0x30, 0x20, 0x43, 0x3a, 0x29, 0x5c, 0x43, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x20, 0x44, 0x69, 0x73, 0x6b, 0x20, 0x51, 0x75, 0x65, 0x75, 0x65, 0x20, 0x4c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x0, 0x5c, 0x5c, 0x54, 0x34, 0x38, 0x30, 0x5c, 0x50, 0x68, 0x79, 0x73, 0x69, 0x63, 0x61, 0x6c, 0x44, 0x69, 0x73, 0x6b, 0x28, 0x5f, 0x54, 0x6f, 0x74, 0x61, 0x6c, 0x29, 0x5c, 0x43, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x20, 0x44, 0x69, 0x73, 0x6b, 0x20, 0x51, 0x75, 0x65, 0x75, 0x65, 0x20, 0x4c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x0, 0x0}
+var unicodeStringListWithCzechChars = []uint16{0x5c, 0x5c, 0x54, 0x34, 0x38, 0x30, 0x5c, 0x46, 0x79, 0x7a, 0x69, 0x63, 0x6b, 0xfd, 0x20, 0x64, 0x69, 0x73, 0x6b, 0x28, 0x30, 0x20, 0x43, 0x3a, 0x29, 0x5c, 0x41, 0x6b, 0x74, 0x75, 0xe1, 0x6c, 0x6e, 0xed, 0x20, 0x64, 0xe9, 0x6c, 0x6b, 0x61, 0x20, 0x66, 0x72, 0x6f, 0x6e, 0x74, 0x79, 0x20, 0x64, 0x69, 0x73, 0x6b, 0x75, 0x0, 0x5c, 0x5c, 0x54, 0x34, 0x38, 0x30, 0x5c, 0x46, 0x79, 0x7a, 0x69, 0x63, 0x6b, 0xfd, 0x20, 0x64, 0x69, 0x73, 0x6b, 0x28, 0x5f, 0x54, 0x6f, 0x74, 0x61, 0x6c, 0x29, 0x5c, 0x41, 0x6b, 0x74, 0x75, 0xe1, 0x6c, 0x6e, 0xed, 0x20, 0x64, 0xe9, 0x6c, 0x6b, 0x61, 0x20, 0x66, 0x72, 0x6f, 0x6e, 0x74, 0x79, 0x20, 0x64, 0x69, 0x73, 0x6b, 0x75, 0x0, 0x0}
+var unicodeStringListSingleItem = []uint16{0x5c, 0x5c, 0x54, 0x34, 0x38, 0x30, 0x5c, 0x50, 0x68, 0x79, 0x73, 0x69, 0x63, 0x61, 0x6c, 0x44, 0x69, 0x73, 0x6b, 0x28, 0x30, 0x20, 0x43, 0x3a, 0x29, 0x5c, 0x43, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x20, 0x44, 0x69, 0x73, 0x6b, 0x20, 0x51, 0x75, 0x65, 0x75, 0x65, 0x20, 0x4c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x0, 0x0}
+var unicodeStringListNoItem = []uint16{0x0}
+
+var stringArrayWithEnglishChars = []string{
+	"\\\\T480\\PhysicalDisk(0 C:)\\Current Disk Queue Length",
+	"\\\\T480\\PhysicalDisk(_Total)\\Current Disk Queue Length",
+}
+var stringArrayWithCzechChars = []string{
+	"\\\\T480\\Fyzick\u00fd disk(0 C:)\\Aktu\u00e1ln\u00ed d\u00e9lka fronty disku",
+	"\\\\T480\\Fyzick\u00fd disk(_Total)\\Aktu\u00e1ln\u00ed d\u00e9lka fronty disku",
+}
+
+var stringArraySingleItem = []string{
+	"\\\\T480\\PhysicalDisk(0 C:)\\Current Disk Queue Length",
+}
+
+func TestUTF16ToStringArray(t *testing.T) {
+	singleItem := UTF16ToStringArray(unicodeStringListSingleItem)
+	assert.True(t, assert.ObjectsAreEqual(singleItem, stringArraySingleItem), "Not equal single arrays")
+
+	noItem := UTF16ToStringArray(unicodeStringListNoItem)
+	assert.Nil(t, noItem)
+
+	engStrings := UTF16ToStringArray(unicodeStringListWithEnglishChars)
+	assert.True(t, assert.ObjectsAreEqual(engStrings, stringArrayWithEnglishChars), "Not equal eng arrays")
+
+	czechStrings := UTF16ToStringArray(unicodeStringListWithCzechChars)
+	assert.True(t, assert.ObjectsAreEqual(czechStrings, stringArrayWithCzechChars), "Not equal czech arrays")
+}