fix: [alert] CephMonDiskLow (monitoring) (#569 )

2026-08-25 16:44:20 +00:00
1 changed files with 2 additions and 2 deletions
@@ -93,5 +93,5 @@ spec:
          labels:
            severity: warning
          annotations:
-            summary: "{{ $labels.instance }} /var below 30% free — Ceph mon will warn"
-            description: "/var on {{ $labels.instance }} is under 30% free, which is Ceph's mon_data_avail_warn threshold, so the mon on this node will report MON_DISK_LOW. Find the actual consumer with `talosctl -n <node> usage /var/lib --depth 1` and then `/var/lib/containerd --depth 1` — note that overlayfs snapshots belong to running containers and are not reclaimable by image GC."
+            summary: "{{ $labels.instance }} /var below 30% free — early warning above Ceph's mon threshold"
+            description: "/var on {{ $labels.instance }} is under 30% free. This is an early-warning margin, not Ceph's threshold: rook-ceph-cluster/cephcluster.yaml overrides mon_data_avail_warn to 20, so the mon on this node reports MON_DISK_LOW only below 20% free. Check whether it actually has, with `ceph_health_detail{name=\"MON_DISK_LOW\"} == 1` in Prometheus, before treating this as a Ceph problem. Find the actual consumer with `talosctl -n <node> usage /var/lib --depth 1` and then `/var/lib/containerd --depth 1` — note that overlayfs snapshots belong to running containers and are not reclaimable by image GC."