Improve Telemetry docs

  * Adding changelog file
  * Adding feature label

doc/development/telemetry/usage_ping.md

@@ -326,7 +326,15 @@ When adding, changing, or updating metrics, please update the [Usage Statistics
 
 Check if new metrics need to be added to the Versions Application. See `usage_data` [schema](https://gitlab.com/gitlab-services/version-gitlab-com/-/blob/master/db/schema.rb#L147) and usage data [parameters accepted](https://gitlab.com/gitlab-services/version-gitlab-com/-/blob/master/app/services/usage_ping.rb). Any metrics added under the `counts` key are saved in the `counts` column.
 
-### 6. Ask for a Telemetry Review
+### 6. Add the feature label
+
+Add the `feature` label to the Merge Request for new Usage Ping metrics. These are user-facing changes and are part of expanding the Usage Ping feature.
+
+### 7. Add a changelog file
+
+Ensure you comply with the [Changelog entries guide](../changelog.md).
+
+### 8. Ask for a Telemetry Review
 
 On GitLab.com, we have DangerBot setup to monitor Telemetry related files and DangerBot will recommend a Telemetry review. Mention `@gitlab-org/growth/telemetry/engineers` in your MR for a review.