fix(internal/circonus): Init/Container status MetricFilters are modif…

…ied for k8s v1.20+

Fix MetricFilters for v1.20+ to not have ^(kube)?

issue #CIRC-8497

Fix default metric filters for k8s v1.20+ to search for the correct
metric names.

* Tags: v1.20+ init container metricfilter

internal/circonus/metric_filters.go

@@ -33,7 +33,7 @@ const (
     ["allow", "^(kube_)?pod_container_status_(running|terminated|waiting|ready)(_count)?$", "containers"],
     ["allow", "^pod_container_status$", "containers"],
     ["allow", "^(kube_)?pod_container_status_(terminated|waiting)_reason(_count)?$", "containers health"],
-    ["allow", "^(kube_)?pod_init_container_status_(terminated|waiting)_reason(_count)?$", "containers health"],
+    ["allow", "^(kube_)?pod_init_container_status_(terminated|waiting)_reason(_count)?$", "init containers health"],
     ["allow", "^kube_deployment_(created|spec_replicas)$", "deployments"],
     ["allow", "^kube_deployment_status_(replicas|replicas_updated|replicas_available|replicas_unavailable)$", "deployments"],
     ["allow", "^kube_job_status_failed$", "health"],
@@ -78,8 +78,8 @@ const (
     ["allow", "^(pod|node)_cpu_usage_seconds_total$", "utilization"],
     ["allow", "^(pod|node)_memory_working_set_bytes$", utilization"],
     ["allow", "^(kube_)?pod_container_status_(running|terminated|waiting|ready)(_count)?$", "containers"],
-    ["allow", "^(kube_)?pod_container_status_(terminated|waiting)_reason(_count)?$", "containers health"],
-    ["allow", "^(kube_)?pod_init_container_status_(terminated|waiting)_reason(_count)?$", "init containers health"],
+    ["allow", "^pod_container_status_(terminated|waiting)_reason(_count)?$", "containers health"],
+    ["allow", "^pod_init_container_status_(terminated|waiting)_reason(_count)?$", "init containers health"],
     ["allow", "^kube_deployment_(created|spec_replicas)$", "deployments"],
     ["allow", "^kube_deployment_status_(replicas|replicas_updated|replicas_available|replicas_unavailable)$", "deployments"],
     ["allow", "^kube_job_status_failed$", "health"],