Update changelog

CHANGELOG.md

@@ -1,18 +1,22 @@
 ## v1.9 [unreleased]
 
-### Release Notes
+#### Release Notes
 
 - The `http_listener` input plugin has been renamed to `influxdb_listener` and
   use of the original name is deprecated.  The new name better describes the
   intended use of the plugin as a InfluxDB relay.  For general purpose
   transfer of metrics in any format via HTTP, it is recommended to use
   `http_listener_v2` instead.
 
-### New Inputs
+#### New Inputs
 
 - [http_listener_v2](/plugins/inputs/http_listener_v2/README.md) - Contributed by @jul1u5
 
-### Features
+#### New Outputs
+
+- [stackdriver](/plugins/outputs/stackdriver/README.md) - Contributed by @jamesmaidment
+
+#### Features
 
 - [#4686](https://github.com/influxdata/telegraf/pull/4686): Add replace function to strings processor.
 - [#4754](https://github.com/influxdata/telegraf/pull/4754): Query servers in parallel in dns_query input.

README.md

@@ -337,6 +337,7 @@ For documentation on the latest development code see the [documentation index][d
 * [riemann](./plugins/outputs/riemann)
 * [riemann_legacy](./plugins/outputs/riemann_legacy)
 * [socket_writer](./plugins/outputs/socket_writer)
+* [stackdriver](./plugins/outputs/stackdriver)
 * [tcp](./plugins/outputs/socket_writer)
 * [udp](./plugins/outputs/socket_writer)
 * [wavefront](./plugins/outputs/wavefront)

plugins/outputs/stackdriver/README.md

@@ -9,10 +9,11 @@ Metrics are grouped by the `namespace` variable and metric key - eg: `custom.goo
 
 ### Configuration
 
-```
+```toml
+[[outputs.stackdriver]]
   # GCP Project
   project = "erudite-bloom-151019"
 
   # The namespace for the metric descriptor
   namespace = "telegraf"
-```
+```