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[HABLE-142] Upgrade notes: MinIO priority class, registry probes, node filesystem alert #719

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[HABLE-142] Upgrade notes: MinIO priority class, registry probes, node filesystem alert #719

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[HABLE-142] Upgrade notes: MinIO priority class, registry probes, nod…
MagicLex Oct 24, 2026
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[HABLE-142] Upgrade notes: priority orders eviction, it does not prev…
MagicLex Oct 24, 2026
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[HABLE-142] Upgrade notes: MinIO runs as a critical pod
MagicLex Oct 27, 2026
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[HABLE-142] Upgrade notes name the kubelet's eviction manager
MagicLex Oct 27, 2026
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[HABLE-142] Upgrade notes: MinIO's priority class is an optional value
MagicLex Oct 27, 2026
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11 changes: 11 additions & 0 deletions docs/setup_installation/admin/upgrade.md
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Expand Up @@ -239,6 +239,17 @@ From 5.3 the default is 2048, up from 1024, because at 1 GiB the sidecar was OOM
While the sidecar restarts, the pod reports `Ready=False` and leaves the endpoints of its service, so the agent, healthy and still running, receives no requests.
Looking for agent restarts finds none.

### MinIO priority class and registry probes { #upgrade-minio-priority }

- `minio.priorityClassName` sets a priority class on the MinIO StatefulSet; it is empty by default.
On a cluster where MinIO keeps its data on a node-local volume, `system-cluster-critical` keeps the kubelet's eviction manager from evicting it under disk pressure, where evicting it frees no disk.
- The registry's liveness probe checks that the process answers, and its readiness probe keeps `/v2/`.
While MinIO is unavailable the registry pods leave the service instead of restarting, and image pulls fail until MinIO is back.
The registry pods are recreated by the upgrade.
- The registry no longer logs its S3 requests (`REGISTRY_STORAGE_S3_LOGLEVEL` is `off`).
- A new Prometheus alert, `NodeRootFilesystemLow` (warning), fires when a node's root filesystem has less than 15% free for 10 minutes.
It is only rendered when `prometheus-node-exporter.enabled` is true.

## Changes from 5.2.2 { #upgrade-changes-from-522 }

These changes ship in 5.2.2 and 5.3.0.
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