Bringing the 2026-04-19 rework to its end-state. Cutover soaked for ~1h
with 0 alerts firing and 127 ops/sec on the v2 master — skipped the
nominal 24h rollback window per user direction.
- Removed `helm_release.redis` (Bitnami chart v25.3.2) from TF. Helm
destroy cleaned up the StatefulSet redis-node (already scaled to 0),
ConfigMaps, ServiceAccount, RBAC, and the deprecated `redis` + `redis-headless`
ClusterIP services that the chart owned.
- Removed `null_resource.patch_redis_service` — the kubectl-patch hack
that worked around the Bitnami chart's broken service selector. No
Helm chart, no patch needed.
- Removed the dead `depends_on = [helm_release.redis]` from the HAProxy
deployment.
- `kubectl delete pvc -n redis redis-data-redis-node-{0,1}` for the two
orphan PVCs the StatefulSet template left behind (K8s doesn't cascade-delete).
- Simplified the top-of-file comment and the redis-v2 architecture
comment — they talked about the parallel-cluster migration state that
no longer exists. Folded in the sentinel hostname gotcha, the redis
8.x image requirement, and the BGSAVE+AOF-rewrite memory reasoning
so the rationale survives in the code rather than only in beads.
- `RedisDown` alert no longer matches `redis-node|redis-v2` — just
`redis-v2` since that's the only StatefulSet now. Kept the `or on()
vector(0)` so the alert fires when kube_state_metrics has no sample
(e.g. after accidental delete).
- `docs/architecture/databases.md` trimmed: no more "pending TF removal"
or "cold rollback for 24h" language.
Verification after apply:
- kubectl get all -n redis: redis-v2-{0,1,2} (3/3 Running) + redis-haproxy-*
(3 pods, PDB minAvailable=2). Services: redis-master + redis-v2-headless only.
- PVCs: data-redis-v2-{0,1,2} only (redis-data-redis-node-* deleted).
- Sentinel: all 3 agree mymaster = redis-v2-0 hostname.
- HAProxy: PING PONG, DBSIZE 92, 127 ops/sec on master.
- Prometheus: 0 firing redis alerts.
Closes: code-v2b
Closes: code-2mw
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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