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Document lifecycle of Gitaly pods running in Kubernetes during rotations/upgrades

Work to be done:

  • Investigate and document how upgrades would work for Gitaly pods, how they respond during rotations or the self-healing process Kubernetes is known for doing.
  • look into how rollbacks work : Performing a Rolling Update
  • Determine which deployment strategy works best for Gitaly.
  • For stateful applications which Gitaly is, normally have a persistent volume. If a blue-green strategy of deployment is used, migration will definitely cause some impact. Document the impact. Extension: documentating what state we have to store.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information