Merge branch 'alinamihaila-master-patch-59234' into 'master'

Update milestone docs for metrics definition

See merge request gitlab-org/gitlab!80914

doc/development/service_ping/metrics_dictionary.md

@@ -47,7 +47,7 @@ Each metric is defined in a separate YAML file consisting of a number of fields:
 | `distribution`      | yes      | `array`; may be set to one of `ce, ee` or `ee`. The [distribution](https://about.gitlab.com/handbook/marketing/strategic-marketing/tiers/#definitions) where the tracked feature is available.  |
 | `performance_indicator_type`  | no      | `array`; may be set to one of [`gmau`, `smau`, `paid_gmau`, or `umau`](https://about.gitlab.com/handbook/business-technology/data-team/data-catalog/xmau-analysis/). |
 | `tier`              | yes      | `array`; may contain one or a combination of `free`, `premium` or `ultimate`. The [tier]( https://about.gitlab.com/handbook/marketing/strategic-marketing/tiers/) where the tracked feature is available. This should be verbose and contain all tiers where a metric is available. |
-| `milestone`         | no       | The milestone when the metric is introduced. |
+| `milestone`         | no       | The milestone when the metric is introduced and when it's available to self-managed instances with the official GitLab release. |
 | `milestone_removed` | no       | The milestone when the metric is removed. |
 | `introduced_by_url` | no       | The URL to the merge request that introduced the metric. |
 | `repair_issue_url`  | no       | The URL of the issue that was created to repair a metric with a `broken` status. |