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jakman85andClaude Opus 4.8 cbc2301b30 docs: reconcile docs/comments with post-upgrade cluster state

Text-only cleanup after the upgrade campaign. Updates stale version
strings, prose, and comments to the verified current facts; no
Kubernetes behavior or version pins changed except the kubectl
toolchain bump (below).

Verified facts applied: k3s v1.36.4+k3s1, Debian 13 trixie,
Cilium 1.20.1 / Gateway API v1.6.1, Longhorn 1.12.1, node RAM 24 GiB,
dedicated virtio2 SSD etcd disk per node, Velero chart 12.x / v1.18,
Grafana 13.2.0.

- Version strings across infra/ and platform/ READMEs + comments
- kubectl toolchain 1.31.4 -> 1.36.4 (devcontainer/ci/conformance
  versions.env; 1.31 vs a 1.36 cluster exceeded the +-1 skew)
- Retired-single-apps-Kustomization refs -> apps-wave-0/1/2 + apps-vms
  with per-wave SOPS decryption (flux/clusters docs + bootstrap.sh)
- COMPLETED/historical banners on the three executed plan docs
- Resolved TODO(WS-SEC) markers -> Renovate-maintained ranges
- Appended dated DECISIONS-LOG entry (2026-08-30) superseding the
  2026-08-26 LIVE STATE line

Left as revalidation items (not blind-edited): external-snapshotter
v8.2.0 vs 1.36, Cilium ext_authz/forward-auth relevance under 1.20.1,
conformance ImageVolume feature-gate assertions under 1.36.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

2026-08-30 15:13:12 -05:00

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external-snapshotter (CSI snapshot control plane)

Installs the cluster-singleton kubernetes-csi/external-snapshotter:

the snapshot.storage.k8s.io CRDs — VolumeSnapshot, VolumeSnapshotContent, VolumeSnapshotClass (v1, GA);
the snapshot-controller Deployment (into kube-system, the upstream default) that reconciles those objects against any CSI driver's CreateSnapshot/DeleteSnapshot.

Neither k3s nor the Longhorn chart ships this. It is a prerequisite for:

VolumeSnapshotClass (driver.longhorn.io) — see ../longhorn/volumesnapshotclass.yaml (applied by platform-config).
CDI snapshot smart-clone — the CDI StorageProfiles set cloneStrategy: snapshot (see ../kubevirt/cdi-storageprofiles.yaml); CDI clones VM disks by taking a CSI VolumeSnapshot instead of a slow host-assisted byte copy.
Clearing the CDIDefaultStorageClassDegraded alert — a default virtualization StorageClass must support both smart-clone and ReadWriteMany.

Wiring

Pass: platform (controllers). Registers the CRDs.
The VolumeSnapshotClass / StorageProfile CRs that consume the CRDs live in the platform-config pass (dependsOn: platform), per the controllers/configs split.

Version

Pinned to v8.2.0 (Renovate-maintained). The v8.x line aligned to Kubernetes 1.31 at v8.1.0; this cluster is now k3s v1.36.4, so the pin should be re-checked for 1.36 (a newer external-snapshotter line may be the version-matched choice) — do not treat v8.2.0 as verified against 1.36 yet. The snapshot-controller image is re-pinned to the same tag via the kustomization images transformer (the upstream setup manifest lags on the image tag).

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external-snapshotter (CSI snapshot control plane)

Wiring

Version

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