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Reliability, upgrades, backup, and observability

Inventory before change

Record distribution/provider, control-plane and node versions, contexts, API resources, CRDs, CNI/CSI, admission, system workloads, nodes, quotas, and representative application health. Use the inventory template and redact credentials.

Upgrade pattern

  1. Confirm support window and version skew from current official docs.
  2. Scan deprecated API usage and operator/webhook compatibility.
  3. Verify backups and restore procedure, not only backup creation.
  4. Check PDBs, capacity, quotas, maintenance windows, and external dependencies.
  5. Upgrade according to the distribution/provider overlay, never generic Kubernetes memory.
  6. Verify API discovery, nodes, system workloads, controllers, representative workloads, storage, routes, and observability.

Upgrades are not reversible by default. A provider may roll back infrastructure while a self-managed distribution may require restore or re-provisioning.

Backups

Back up the actual stateful substrate: etcd or the distribution's datastore, PKI/configuration, manifests, persistent data, and provider resources. Test restoration into a disposable environment. An etcd snapshot alone is not automatically an application-consistent backup.

Observability

Collect API audit, events, control-plane/component logs where accessible, node conditions, workload logs, metrics, HPA signals, and provider control-plane events. Distinguish “metrics unavailable” from “metric is zero.”

Sources

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