From a2f386dfec4c4e8d0ad90cd48ff84c6a6eed6c8b Mon Sep 17 00:00:00 2001
From: Manish <myathnal@redhat.com>
Date: Wed, 6 Dec 2023 19:08:59 +0530
Subject: [PATCH] Alert user if ceph metadata server is consuming cpu at
 threshold point.

Signed-off-by: Manish <myathnal@redhat.com>
---
 metrics/deploy/prometheus-ocs-rules.yaml | 13 +++++++++++++
 metrics/mixin/alerts/perf.libsonnet      | 16 ++++++++++++++++
 metrics/mixin/config.libsonnet           |  2 ++
 3 files changed, 31 insertions(+)

diff --git a/metrics/deploy/prometheus-ocs-rules.yaml b/metrics/deploy/prometheus-ocs-rules.yaml
index 0aae30b74c..bb7d504c01 100644
--- a/metrics/deploy/prometheus-ocs-rules.yaml
+++ b/metrics/deploy/prometheus-ocs-rules.yaml
@@ -277,3 +277,16 @@ spec:
       for: 5m
       labels:
         severity: critical
+    - alert: MDSCPUUsageHigh
+      annotations:
+        description: |-
+          Ceph metadata server pod ({{ $labels.pod }}) has high cpu usage.
+          Please consider increasing the number of active metadata servers,
+          it can be done by increasing the number of activeMetadataServers parameter in the StorageCluster CR.
+        message: Ceph metadata server pod ({{ $labels.pod }}) has high cpu usage
+        severity_level: warning
+      expr: |
+        pod:container_cpu_usage:sum{pod=~"rook-ceph-mds.*"}/ on(pod) kube_pod_resource_limit{resource='cpu',pod=~"rook-ceph-mds.*"} > 0.67
+      for: 6h
+      labels:
+        severity: warning
diff --git a/metrics/mixin/alerts/perf.libsonnet b/metrics/mixin/alerts/perf.libsonnet
index add41743e7..0f24c3b3d1 100644
--- a/metrics/mixin/alerts/perf.libsonnet
+++ b/metrics/mixin/alerts/perf.libsonnet
@@ -19,6 +19,22 @@
               severity_level: 'error',
             },
           },
+
+          {
+            alert: 'MDSCPUUsageHigh',
+            expr: |||
+              pod:container_cpu_usage:sum{%(mdsSelector)s}/ on(pod) kube_pod_resource_limit{resource='cpu',%(mdsSelector)s} > 0.67
+            ||| % $._config,
+            'for': $._config.mds_cpu_usage_high_threshold_duration,
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: 'Ceph metadata server pod ({{ $labels.pod }}) has high cpu usage',
+              description: 'Ceph metadata server pod ({{ $labels.pod }}) has high cpu usage.\nPlease consider increasing the number of active metadata servers,\nit can be done by increasing the number of activeMetadataServers parameter in the StorageCluster CR.',
+              severity_level: 'warning',
+            },
+          },
         ],
       },
     ],
diff --git a/metrics/mixin/config.libsonnet b/metrics/mixin/config.libsonnet
index 1b982fcd92..bfb90ea317 100644
--- a/metrics/mixin/config.libsonnet
+++ b/metrics/mixin/config.libsonnet
@@ -14,6 +14,8 @@
     blockedRBDClientAlertTime: '10s',
     ocsStorageClusterKMSConnectionAlert: '5s',
     mdsCacheUsageAlertTime: '5m',
+    mdsSelector: 'pod=~"rook-ceph-mds.*"',
+    mds_cpu_usage_high_threshold_duration: '6h',
 
     // Constants
     objectStorageType: 'RGW',