DORA Metrics retention period and requirements update (#33265)

* Added retention + small edits

Add retention period to 2 years and changed Change lead time requirement for better clarity.

* Update content/en/dora_metrics/setup/deployments.md

Co-authored-by: Joe Peeples <[email protected]>

* Update content/en/dora_metrics/setup/deployments.md

Co-authored-by: Joe Peeples <[email protected]>

---------

Co-authored-by: Joe Peeples <[email protected]>

Author: Tecoddy

content/en/dora_metrics/data_collected/_index.md

@@ -26,7 +26,9 @@ DORA Metrics generates events that have associated fields and tags.
 |Commit | A commit event is generated for each individual commit included in a deployment. These events contain metadata and are automatically linked to the corresponding deployment.
 |Failure | A failure in production, such as an incident, rollback, or alert.
 
-#### Default tags
+**Note**: DORA Metrics events have a 2-year retention period.
+
+### Default tags
 
 All events contain the following tags if any are available:
 
@@ -41,7 +43,7 @@ All events contain the following tags if any are available:
 
 For more information about using tags, see [Getting Started with Tags][6].
 
-#### Custom tags
+### Custom tags
 
 In addition to the tags above, deployment and failure events can be enriched with custom tags to filter DORA Metrics. There are three potential sources for these tags:
 

content/en/dora_metrics/setup/deployments.md

@@ -160,7 +160,8 @@ For service deployments tracked by APM to contribute to change lead time, ensure
 
 ### Requirements for calculating change lead time
 - Your application telemetry is tagged with Git information. You can enable this [in APM][101] or see the [Source Code Integration documentation][102].
-- Your repository metadata is synchronized to Datadog through the [GitHub integration][103] or by the `datadog-ci git-metadata upload` command.
+- Your repository metadata is [synchronized](#synchronize-repository-metadata-to-datadog) to Datadog.
+
 
 [101]: https://app.datadoghq.com/source-code/setup/apm
 [102]: /integrations/guide/source-code-integration/?tab=go#tag-your-telemetry-with-git-information
@@ -174,7 +175,7 @@ For service deployments tracked by the DORA Metrics API or the `datadog-ci dora
 ### Requirements for calculating change lead time
 
 - The attributes `repository_url` and `commit_sha` are included in the deployment events payload.
-- Your repository metadata is synchronized to Datadog through the [GitHub integration][101] or by the `datadog-ci git-metadata upload` command.
+- Your repository metadata is [synchronized](#synchronize-repository-metadata-to-datadog) to Datadog.
 
 [101]: /integrations/github/