Update documentation to match APM template changes

[SharkBaitDLS]

The template now includes the overhead metric as a default so we include
it in the recommended configuration.

Also fix the Subscriptions heading to be at the correct nesting level
instead of being a subheader under Uplink.

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Checklist

Complete the checklist (and note appropriate exceptions) before the PR is marked ready-for-review.

• PR description explains the motivation for the change and relevant context for reviewing
• PR description links appropriate GitHub/Jira tickets (creating when necessary)
• Changeset is included for user-facing changes
• Changes are compatible¹
• Documentation² completed
• Performance impact assessed and acceptable
• Metrics and logs are added³ and documented
• Tests added and passing⁴
  • Unit tests
  • Integration tests
  • Manual tests, as necessary

Exceptions

Note any exceptions here

Notes

Footnotes

1. It may be appropriate to bring upcoming changes to the attention of other (impacted) groups. Please endeavour to do this before seeking PR approval. The mechanism for doing this will vary considerably, so use your judgement as to how and when to do this. ↩

2. Configuration is an important part of many changes. Where applicable please try to document configuration examples. ↩

3. A lot of (if not most) features benefit from built-in observability and debug-level logs. Please read this guidance on metrics best-practices. ↩

4. Tick whichever testing boxes are applicable. If you are adding Manual Tests, please document the manual testing (extensively) in the Exceptions. ↩

[github-actions]

@SharkBaitDLS, please consider creating a changeset entry in /.changesets/. These instructions describe the process and tooling.

[apollo-librarian]

✅ Docs preview ready

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File Changes

0 new, 2 changed, 0 removed

* graphos/routing/(latest)/observability/router-telemetry-otel/apm-guides/datadog/router-instrumentation.mdx
* graphos/routing/(latest)/observability/router-telemetry-otel/enabling-telemetry/standard-instruments.mdx

Build ID: 20804e5b6758e6ad01fd6b75
Build Logs: View logs

URL: https://www.apollographql.com/docs/deploy-preview/20804e5b6758e6ad01fd6b75

[pragl]

LGTM!