Add the ability to set extraMetricProcessingRules for cadvisor

Author: fplantinga-guida

charts/feature-cluster-metrics/templates/_cadvisor.alloy.tpl

@@ -102,6 +102,9 @@ prometheus.relabel "cadvisor" {
     target_label = "__keepme"
     replacement = ""
   }
+{{- end }}
+{{- if .Values.cadvisor.extraMetricProcessingRules }}
+{{ .Values.cadvisor.extraMetricProcessingRules | indent 2 }}
 {{- end }}
   forward_to = argument.metrics_destinations.value
 }