Create an audit log of deleted runners by namespace

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Overview

In the Implement worker to remove stale runners from GitLab SaaS issue, we are introducing a background job that will regularly prune stale runners from a given namespace. We should have an audit log of the pruned runners ids by namespace.

Proposal

• Create an audit log of deleted runners by namespace.

Implementation details

• Audit log format: Deleted 2 stale runners in namespace with ID 10, from a list of 3 runners with the following IDs: \[343, 897, 8743\]

• audit log metadata:

  • a namespace ID
  • an array of runner IDs requested for deletion, and
  • the total count of runners actually deleted.