fix: [alert] CephPoolLostRedundancy (rook-ceph) (#968 )

2026-09-25 17:44:07 +00:00
1 changed files with 9 additions and 5 deletions
@@ -52,19 +52,23 @@ spec:
        - alert: CephPoolLostRedundancy
          # Names the pool, which POOL_NO_REDUNDANCY does not.
          #
-          # There is no pool-size metric, but bytes_used/stored IS the
-          # replication factor. The >1e6 floor drops pools too small to measure
-          # meaningfully, empty ones included.
+          # There is no pool-size metric, but bytes_used/stored is the
+          # replication factor for replicated pools and (k+m)/k for EC pools.
+          # The EC 2+1 pools (cephfs-bulk, rgw buckets.data) sit at exactly
+          # 1.5 with ~1e-7 accounting drift either side, so the cut-off is
+          # midway between them and an unreplicated pool (1.0) (#968).
+          # The >1e6 floor drops pools too small to measure meaningfully,
+          # empty ones included.
          #
          # No pool is exempt.
          expr: |
-            ceph_pool_bytes_used / ceph_pool_stored < 1.5 and ceph_pool_stored > 1e6
+            ceph_pool_bytes_used / ceph_pool_stored < 1.25 and ceph_pool_stored > 1e6
          for: 30m
          labels:
            severity: critical
          annotations:
            summary: "Ceph pool {{ $labels.pool_id }} is running unreplicated"
-            description: "Pool {{ $labels.pool_id }} has a replication factor below 1.5, meaning a single OSD loss destroys data. No pool is meant to be unreplicated — an unreplicated pool also blocks ALL OSD maintenance cluster-wide, since `ceph osd ok-to-stop` refuses while its PGs would go offline. Check with `kubectl -n rook-ceph exec deploy/rook-ceph-tools -- ceph osd pool ls detail`."
+            description: "Pool {{ $labels.pool_id }} has a raw/stored ratio below 1.25 (replicated size 1), meaning a single OSD loss destroys data. No pool is meant to be unreplicated — an unreplicated pool also blocks ALL OSD maintenance cluster-wide, since `ceph osd ok-to-stop` refuses while its PGs would go offline. Check with `kubectl -n rook-ceph exec deploy/rook-ceph-tools -- ceph osd pool ls detail`."

        - alert: CephHealthError
          # HEALTH_ERR means data availability or redundancy is at risk.