--- apiVersion: monitoring.coreos.com/v1 kind: PrometheusRule metadata: creationTimestamp: "2026-02-17T12:49:35Z" generation: 1 labels: app.kubernetes.io/component: prometheus app.kubernetes.io/instance: k8s app.kubernetes.io/managed-by: cluster-monitoring-operator app.kubernetes.io/name: prometheus app.kubernetes.io/part-of: openshift-monitoring app.kubernetes.io/version: 3.5.0 prometheus: k8s role: alert-rules managedFields: - apiVersion: monitoring.coreos.com/v1 fieldsType: FieldsV1 fieldsV1: f:metadata: f:labels: .: {} f:app.kubernetes.io/component: {} f:app.kubernetes.io/instance: {} f:app.kubernetes.io/managed-by: {} f:app.kubernetes.io/name: {} f:app.kubernetes.io/part-of: {} f:app.kubernetes.io/version: {} f:prometheus: {} f:role: {} f:spec: .: {} f:groups: .: {} k:{"name":"thanos-sidecar"}: .: {} f:name: {} f:rules: {} manager: operator operation: Update time: "2026-02-17T12:49:35Z" name: prometheus-k8s-thanos-sidecar-rules namespace: openshift-monitoring resourceVersion: "9155" uid: 2d3fc5ce-a674-4996-a86f-240347b9da51 spec: groups: - name: thanos-sidecar rules: - alert: ThanosSidecarBucketOperationsFailed annotations: description: Thanos Sidecar {{$labels.instance}} in {{$labels.namespace}} bucket operations are failing summary: Thanos Sidecar bucket operations are failing expr: | sum by (namespace, job, instance) (rate(thanos_objstore_bucket_operation_failures_total{job=~"prometheus-(k8s|user-workload)-thanos-sidecar"}[5m])) > 0 for: 1h labels: severity: warning - alert: ThanosSidecarNoConnectionToStartedPrometheus annotations: description: Thanos Sidecar {{$labels.instance}} in {{$labels.namespace}} is unhealthy. summary: Thanos Sidecar cannot access Prometheus, even though Prometheus seems healthy and has reloaded WAL. expr: | thanos_sidecar_prometheus_up{job=~"prometheus-(k8s|user-workload)-thanos-sidecar"} == 0 AND on (namespace, pod) prometheus_tsdb_data_replay_duration_seconds != 0 for: 1h labels: severity: warning