jsonnet: Patch metric relabelings for control plane

We drop some pod-centric metrics from cAdvisor to reduce cardinality.
This metrics are available at the slice level.

Author: philipgough

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 4.10
 
 - [#1299](https://github.com/openshift/cluster-monitoring-operator/pull/1299) Expose expose /api/v1/labels endpoint for Thanos query.
+- [#1402](https://github.com/openshift/cluster-monitoring-operator/pull/1402) Drop pod-centric cAdvisor metrics that are available at slice level.
 
 ## 4.9
 

assets/control-plane/service-monitor-kubelet.yaml

@@ -80,6 +80,11 @@ spec:
       regex: container_memory_failures_total
       sourceLabels:
       - __name__
+    - action: drop
+      regex: (container_fs_.*);.+
+      sourceLabels:
+      - __name__
+      - container
     path: /metrics/cadvisor
     port: https-metrics
     relabelings:

jsonnet/components/control-plane.libsonnet

@@ -88,6 +88,12 @@ function(params)
                       action: 'drop',
                       regex: 'container_memory_failures_total',
                     },
+                    {
+                      // these metrics are available at the slice level
+                      sourceLabels: ['__name__', 'container'],
+                      action: 'drop',
+                      regex: '(container_fs_.*);.+',
+                    },
                   ],
                 }
               else