Update docs for newrelic output

CHANGELOG.md

@@ -16,6 +16,10 @@
 - [defaults](/plugins/processors/defaults/README.md) - Contributed by @jregistr
 - [filepath](/plugins/processors/filepath/README.md) - Contributed by @kir4h
 
+#### New Outputs
+
+- [newrelic](/plugins/outputs/newrelic/README.md) - Contributed by @hsinghkalsi
+
 #### Features
 
 - [#6905](https://github.com/influxdata/telegraf/pull/6905): Add commands stats to mongodb input plugin.

docs/LICENSE_OF_DEPENDENCIES.md

@@ -107,6 +107,7 @@ following works:
 - github.com/nats-io/nats.go [Apache License 2.0](https://github.com/nats-io/nats.go/blob/master/LICENSE)
 - github.com/nats-io/nkeys [Apache License 2.0](https://github.com/nats-io/nkeys/blob/master/LICENSE)
 - github.com/nats-io/nuid [Apache License 2.0](https://github.com/nats-io/nuid/blob/master/LICENSE)
+- github.com/newrelic/newrelic-telemetry-sdk-go [Apache License 2.0](https://github.com/newrelic/newrelic-telemetry-sdk-go/blob/master/LICENSE.md)
 - github.com/nsqio/go-nsq [MIT License](https://github.com/nsqio/go-nsq/blob/master/LICENSE)
 - github.com/openconfig/gnmi [Apache License 2.0](https://github.com/openconfig/gnmi/blob/master/LICENSE)
 - github.com/opencontainers/go-digest [Apache License 2.0](https://github.com/opencontainers/go-digest/blob/master/LICENSE)

plugins/outputs/newrelic/README.md

@@ -1,22 +1,21 @@
 #New Relic output plugin
 
-This plugins writes to New Relic insights.
+This plugins writes to New Relic Insights using the [Metrics API][].
 
-```
+To use this plugin you must first obtain an [Insights API Key][].
+
+### Configuration
+```toml
 [[outputs.newrelic]]
   ## New Relic Insights API key
   insights_key = "insights api key"
 
-# metric_prefix if defined, prefix's metrics name for easy identification
+  ## Prefix to add to add to metric name for easy identification.
   # metric_prefix = ""
 
-# harvest timeout, default is 15 seconds
+  ## Timeout for writes to the New Relic API.
   # timeout = "15s"
 ```
-####Parameters
 
-|Parameter Name|Type|Description|
-|:-|:-|:-|
-| insights_key | Required | Insights API Insert key  |
-| metric_prefix | Optional | If defined, prefix's metrics name for easy identification |
-| timeout | Optional | If defined, changes harvest timeout |
+[Metrics API]: https://docs.newrelic.com/docs/data-ingest-apis/get-data-new-relic/metric-api/introduction-metric-api
+[Insights API Key]: https://docs.newrelic.com/docs/apis/get-started/intro-apis/types-new-relic-api-keys#user-api-key

plugins/outputs/newrelic/newrelic.go

@@ -16,14 +16,15 @@ import (
 
 // NewRelic nr structure
 type NewRelic struct {
-	harvestor    *telemetry.Harvester
-	dc           *cumulative.DeltaCalculator
 	InsightsKey  string            `toml:"insights_key"`
 	MetricPrefix string            `toml:"metric_prefix"`
 	Timeout      internal.Duration `toml:"timeout"`
+
+	harvestor   *telemetry.Harvester
+	dc          *cumulative.DeltaCalculator
 	savedErrors map[int]interface{}
 	errorCount  int
-	Client       http.Client
+	Client      http.Client `toml:"-"`
 }
 
 // Description returns a one-sentence description on the Output
@@ -34,13 +35,13 @@ func (nr *NewRelic) Description() string {
 // SampleConfig : return  default configuration of the Output
 func (nr *NewRelic) SampleConfig() string {
 	return `
-	## New Relic Insights API key (required)
+  ## New Relic Insights API key
   insights_key = "insights api key"
 
-	# metric_prefix if defined, prefix's metrics name for easy identification (optional)
+  ## Prefix to add to add to metric name for easy identification.
   # metric_prefix = ""
 
-	# harvest timeout, default is 15 seconds
+  ## Timeout for writes to the New Relic API.
   # timeout = "15s"
 `
 }
@@ -77,7 +78,6 @@ func (nr *NewRelic) Connect() error {
 
 // Close any connections to the Output
 func (nr *NewRelic) Close() error {
-
 	nr.errorCount = 0
 	nr.Client.CloseIdleConnections()
 	return nil
@@ -85,7 +85,6 @@ func (nr *NewRelic) Close() error {
 
 // Write takes in group of points to be written to the Output
 func (nr *NewRelic) Write(metrics []telegraf.Metric) error {
-
 	nr.errorCount = 0
 	nr.savedErrors = make(map[int]interface{})