Remove Embed Grafana panels in Markdown

For guidance on the overall deprecations, removals and breaking changes workflow, please visit Breaking changes, deprecations, and removing features

Deprecation Summary

The ability to add Grafana panels in GitLab Flavored Markdown is deprecated in 15.9 and will be removed in 16.0. This feature will be replaced by the ability to embed traces or errors with GitLab Observability.

Breaking Change

• Add the breaking change label to this issue.
• Add instructions for how users can update their workflow.

Affected Topology

Affected Tier

GitLab Free

Checklists

Labels

• This issue is labeled deprecation, and with the relevant ~devops::, ~group::, and ~Category: labels.
• This issue is labeled breaking change if the removal of the deprecated item will be a breaking change.

Timeline

Please add links to the relevant merge requests.

• As soon as possible, but no later than the third milestone preceding the major release (for example, given the following release schedule: 14.8, 14.9, 14.10, 15.0 – 14.8 is the third milestone preceding the major release):
  • A deprecation announcement entry has been created so the deprecation will appear in release posts and on the general deprecation page.
  • Documentation has been updated to mark the feature as deprecated.
• On or before the major milestone: A removal entry has been created so the removal will appear on the removals by milestones page and be announced in the release post. (Reverted) Removal Entry - Embed Grafana panels... (!112249 - merged)
• On the major milestone:
  • The deprecated item has been removed.
  • If the removal of the deprecated item is a breaking change, the merge request is labeled breaking change.

Mentions

• Your stage's stable counterparts have been @mentioned on this issue. For example, Customer Support, Customer Success (Technical Account Manager), Product Marketing Manager.
  • To see who the stable counterparts are for a product team visit product categories
    • If there is no stable counterpart listed for Sales/CS please mention @timtams
    • If there is no stable counterpart listed for Support please mention @gitlab-com/support/managers
    • If there is no stable counterpart listed for Marketing please mention @cfoster3
• Your GPM has been @mentioned so that they are aware of planned deprecations. The goal is to have reviews happen at least two releases before the final removal of the feature or introduction of a breaking change.

Deprecation Milestone

Planned Removal Milestone

Links

The removal work will be tracked in scope of Monitor: Metrics Deprecation and Removal (&10107 - closed), because the features are highly interconnected.

These are the relevant issues to this removal:

• Metrics: Delete GFM pipeline logic for embeds (#397137 - closed) (grafana + regular metrics embeds)
• Metrics: Delete UI for Monitor Metrics view (#393929 - closed) (grafana + regular metrics embeds)
• Metrics: Delete UI for Grafana authentication (#394865 - closed) (grafana only)