'discard' output plugin

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - [#1564](https://github.com/influxdata/telegraf/issues/1564): Use RFC3339 timestamps in log output.
 - [#1997](https://github.com/influxdata/telegraf/issues/1997): Non-default HTTP timeouts for RabbitMQ plugin.
+- [#2074](https://github.com/influxdata/telegraf/pull/2074): "discard" output plugin added, primarily for testing purposes.
 
 ### Bugfixes
 

README.md

@@ -245,6 +245,7 @@ Telegraf can also collect metrics via the following service plugins:
 * [aws kinesis](./plugins/outputs/kinesis)
 * [aws cloudwatch](./plugins/outputs/cloudwatch)
 * [datadog](./plugins/outputs/datadog)
+* [discard](./plugins/outputs/discard)
 * [file](./plugins/outputs/file)
 * [graphite](./plugins/outputs/graphite)
 * [graylog](./plugins/outputs/graylog)

plugins/outputs/all/all.go

@@ -5,6 +5,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/outputs/amqp"
 	_ "github.com/influxdata/telegraf/plugins/outputs/cloudwatch"
 	_ "github.com/influxdata/telegraf/plugins/outputs/datadog"
+	_ "github.com/influxdata/telegraf/plugins/outputs/discard"
 	_ "github.com/influxdata/telegraf/plugins/outputs/file"
 	_ "github.com/influxdata/telegraf/plugins/outputs/graphite"
 	_ "github.com/influxdata/telegraf/plugins/outputs/graylog"

plugins/outputs/discard/README.md

@@ -0,0 +1,12 @@
+# discard Output Plugin
+
+This output plugin simply drops all metrics that are sent to it. It is only
+meant to be used for testing purposes.
+
+### Configuration:
+
+```toml
+# Send metrics to nowhere at all
+[[outputs.discard]]
+  # no configuration
+```

plugins/outputs/discard/discard.go

@@ -0,0 +1,18 @@
+package discard
+
+import (
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/outputs"
+)
+
+type Discard struct{}
+
+func (d *Discard) Connect() error                        { return nil }
+func (d *Discard) Close() error                          { return nil }
+func (d *Discard) SampleConfig() string                  { return "" }
+func (d *Discard) Description() string                   { return "Send metrics to nowhere at all" }
+func (d *Discard) Write(metrics []telegraf.Metric) error { return nil }
+
+func init() {
+	outputs.Add("discard", func() telegraf.Output { return &Discard{} })
+}