Add prometheus admin flag feature to helm, kube-prometheus and jsonnet files

jsonnet/kube-prometheus/kube-prometheus.libsonnet

@@ -82,6 +82,8 @@ local configMapList = k.core.v1.configMapList;
     prometheusSelector: 'job="prometheus-k8s"',
     prometheusOperatorSelector: 'job="prometheus-operator"',
 
+    enableAdminApi: 'true',
+
     jobs: {
       Kubelet: $._config.kubeletSelector,
       KubeScheduler: $._config.kubeSchedulerSelector,
@@ -97,6 +99,7 @@ local configMapList = k.core.v1.configMapList;
 
     prometheus+:: {
       rules: $.prometheusRules + $.prometheusAlerts,
+      enableAdminApi: $._config.enableAdminApi,
     },
 
     grafana+:: {

jsonnet/kube-prometheus/prometheus/prometheus.libsonnet

@@ -18,6 +18,7 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
 
     prometheus+:: {
       name: 'k8s',
+      enableAdminApi: 'true',
       replicas: 2,
       rules: {},
       renderedRules: {},
@@ -168,6 +169,7 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
           replicas: $._config.prometheus.replicas,
           version: $._config.versions.prometheus,
           baseImage: $._config.imageRepos.prometheus,
+          enableAdminApi: $._config.prometheus.enableAdminApi,
           serviceAccountName: 'prometheus-' + $._config.prometheus.name,
           serviceMonitorSelector: {},
           serviceMonitorNamespaceSelector: {},