The DaemonSet came up with Init:Error, kubectl: not found. The build had pushed sha256:3bc85006 for bird:2026-09-16, but every pod resolved that tag to sha256:75e19214 — the first build of the same day, from before kubectl was added.
imagePullPolicy: Always does not help: it re-pulls, but the tag itself resolves to the stale digest. Deleting the pods changed nothing; three fresh pods on three nodes all resolved to the old digest. A one-off pod pulling the digest directly ran kubectl 1.33.1 and BIRD 2.17.2, so the registry holds the right image and only tag resolution is stale.
The dated tag cannot carry a same-day rebuild, and this image was rebuilt three times today. Referencing the digest makes the deployment deterministic. The cost is that the reference has to be updated whenever the image is rebuilt; the alternative, tagging by commit, does not work for a manifest living in the same commit.
Refs #576
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>