Feature Request: API endpoint for Praefect Dataloss

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Proposal

Currently admins must SSH into a Praefect server and the CLI command praefect dataloss to determine if there are outdated repositories / potential dataloss. This is slow and difficult to automate, particularly because the output is not in a machine-readable format.

An API endpoint to report this data would be useful to allow admins to setup automatic health checks on their Gitaly Cluster.

This would require a number of changes to implement:

• Add a new API endpoint to gitlab
• Create a new RPC for this type of request in gitlab and gitaly
• Implement the new RPC in gitaly

/cc @cupini @mjwood