Geo DR: dashboard improvement brainstorm

Description

Here are the current screenshots of the dashboard to manage Geo and DR:

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What could we do to make them better? Let's use this issue to brainstorm. Once we'll get a better idea of what we want to accomplish, we'll create separate issues for them.

Proposal

  1. Indicate the reason why a repository failed to sync
  2. We only mention repositories synced status. Can we add % files replicated as well?
  3. Should we allow to remove the primary node?
  4. How does it look when we detect a health problem?
  5. Is there a button to add a new node? How do nodes get detected?
  6. Show date of last time synced (I have the feeling it would be reassuring)?
  7. Show if a sync is currently in progress