The version range >=72.0.0 let Flux upgrade the chart unattended
(91.5.2 -> 91.7.0 at 19:43 UTC on 2026-09-26, no git commit). That
restart moved Prometheus onto k8s-1 while its Ceph RBD mounts were
broken, causing a ~48 min alerting outage (REN-198).
Pinned to the version already deployed, so reconcile is a no-op.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>