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k8s-version-upgrade: move detection to nightly 23:00 UTC (overnight upgrades)
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Disruptive node drains should run when the cluster is idle. Move the
k8s-version-check detection CronJob from 12:00 UTC (noon) to 23:00 UTC
(00:00 London) — overnight, low usage, and clear of the kured OS-reboot window
(01:00-05:00 UTC) so the two drain pipelines never overlap. (Viktor, 2026-06-17.)

  - stacks/k8s-version-upgrade/main.tf: var.schedule default 0 12 → 0 23 * * *.
  - scripts/upgrade_state.sh: next_scheduled_run_utc now computes the 23:00 slot
    (was next_daily_noon_utc).
  - docs (runbook, architecture) + upgrade-state SKILL: schedule references
    updated to 23:00 UTC nightly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Viktor Barzin 2026-06-17 18:16:32 +00:00
parent ed53b34bf4
commit c04efa3d3a
5 changed files with 22 additions and 21 deletions
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2
docs/architecture/automated-upgrades.md
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@ -252,7 +252,7 @@ kubeadm/kubelet/kubectl bumps (patch + minor) on all 5 K8s VMs.
### Architecture
```
k8s-version-check CronJob (Sun 12:00 UTC, k8s-upgrade ns)
k8s-version-check CronJob (23:00 UTC nightly, k8s-upgrade ns)
│ probe apt-cache madison kubeadm (master) → latest available patch
│ probe HEAD https://pkgs.k8s.io/.../v<NEXT_MINOR>/deb/Release → next minor?
│ push k8s_upgrade_available metric to Pushgateway