replaced default namespaces rbac rules by a loop

docs/monitoring-other-namespaces.md

 # Monitoring other Kubernetes Namespaces
-This guide will help you monitor applications in other Namespaces, which is only enabled for the `Default` Namespace during Install.
+This guide will help you monitor applications in other Namespaces. By default the RBAC rules are only enabled for the `Default` and `kube-system` Namespace during Install.
 
 # Setup
 You have to give the list of the Namespaces that you want to be able to monitor.
@@ -12,7 +12,7 @@ local kp = (import 'kube-prometheus/kube-prometheus.libsonnet') + {
     namespace: 'monitoring',
 
     prometheus+:: {
-      roleSpecificNamespaces: ["foo"],
+      namespaces: ["default", "kube-system","foo"],
     },
   },
 };

jsonnet/kube-prometheus/prometheus/prometheus.libsonnet

@@ -21,7 +21,7 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
       replicas: 2,
       rules: {},
       renderedRules: {},
-      roleSpecificNamespaces: [],
+      namespaces: ["default", "kube-system",$._config.namespace],
     },
   },
 
@@ -56,16 +56,6 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
           groups: $._config.prometheus.rules.groups,
         },
       },
-    roleBindingDefault:
-      local roleBinding = k.rbac.v1.roleBinding;
-
-      roleBinding.new() +
-      roleBinding.mixin.metadata.withName('prometheus-' + $._config.prometheus.name) +
-      roleBinding.mixin.metadata.withNamespace('default') +
-      roleBinding.mixin.roleRef.withApiGroup('rbac.authorization.k8s.io') +
-      roleBinding.mixin.roleRef.withName('prometheus-' + $._config.prometheus.name) +
-      roleBinding.mixin.roleRef.mixinInstance({ kind: 'Role' }) +
-      roleBinding.withSubjects([{ kind: 'ServiceAccount', name: 'prometheus-' + $._config.prometheus.name, namespace: $._config.namespace }]),
     roleBindingSpecificNamespace:
       local roleBinding = k.rbac.v1.roleBinding;
 
@@ -123,16 +113,6 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
       roleBinding.mixin.roleRef.withName('prometheus-' + $._config.prometheus.name + '-config') +
       roleBinding.mixin.roleRef.mixinInstance({ kind: 'Role' }) +
       roleBinding.withSubjects([{ kind: 'ServiceAccount', name: 'prometheus-' + $._config.prometheus.name, namespace: $._config.namespace }]),
-    roleBindingNamespace:
-      local roleBinding = k.rbac.v1.roleBinding;
-
-      roleBinding.new() +
-      roleBinding.mixin.metadata.withName('prometheus-' + $._config.prometheus.name) +
-      roleBinding.mixin.metadata.withNamespace($._config.namespace) +
-      roleBinding.mixin.roleRef.withApiGroup('rbac.authorization.k8s.io') +
-      roleBinding.mixin.roleRef.withName('prometheus-' + $._config.prometheus.name) +
-      roleBinding.mixin.roleRef.mixinInstance({ kind: 'Role' }) +
-      roleBinding.withSubjects([{ kind: 'ServiceAccount', name: 'prometheus-' + $._config.prometheus.name, namespace: $._config.namespace }]),
     clusterRoleBinding:
       local clusterRoleBinding = k.rbac.v1.clusterRoleBinding;
 
@@ -142,42 +122,6 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
       clusterRoleBinding.mixin.roleRef.withName('prometheus-' + $._config.prometheus.name) +
       clusterRoleBinding.mixin.roleRef.mixinInstance({ kind: 'ClusterRole' }) +
       clusterRoleBinding.withSubjects([{ kind: 'ServiceAccount', name: 'prometheus-' + $._config.prometheus.name, namespace: $._config.namespace }]),
-    roleKubeSystem:
-      local role = k.rbac.v1.role;
-      local policyRule = role.rulesType;
-
-      local coreRule = policyRule.new() +
-                       policyRule.withApiGroups(['']) +
-                       policyRule.withResources([
-                         'nodes',
-                         'services',
-                         'endpoints',
-                         'pods',
-                       ]) +
-                       policyRule.withVerbs(['get', 'list', 'watch']);
-
-      role.new() +
-      role.mixin.metadata.withName('prometheus-' + $._config.prometheus.name) +
-      role.mixin.metadata.withNamespace('kube-system') +
-      role.withRules(coreRule),
-    roleDefault:
-      local role = k.rbac.v1.role;
-      local policyRule = role.rulesType;
-
-      local coreRule = policyRule.new() +
-                       policyRule.withApiGroups(['']) +
-                       policyRule.withResources([
-                         'nodes',
-                         'services',
-                         'endpoints',
-                         'pods',
-                       ]) +
-                       policyRule.withVerbs(['get', 'list', 'watch']);
-
-      role.new() +
-      role.mixin.metadata.withName('prometheus-' + $._config.prometheus.name) +
-      role.mixin.metadata.withNamespace('default') +
-      role.withRules(coreRule),
     roleSpecificNamespace:
       local role = k.rbac.v1.role;
       local policyRule = role.rulesType;
@@ -199,34 +143,6 @@ local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
         
       local roleList = k.rbac.v1.roleList;
       roleList.new([newSpecificRole(x) for x in $._config.prometheus.roleSpecificNamespaces]),
-    roleBindingKubeSystem:
-      local roleBinding = k.rbac.v1.roleBinding;
-
-      roleBinding.new() +
-      roleBinding.mixin.metadata.withName('prometheus-' + $._config.prometheus.name) +
-      roleBinding.mixin.metadata.withNamespace('kube-system') +
-      roleBinding.mixin.roleRef.withApiGroup('rbac.authorization.k8s.io') +
-      roleBinding.mixin.roleRef.withName('prometheus-' + $._config.prometheus.name) +
-      roleBinding.mixin.roleRef.mixinInstance({ kind: 'Role' }) +
-      roleBinding.withSubjects([{ kind: 'ServiceAccount', name: 'prometheus-' + $._config.prometheus.name, namespace: $._config.namespace }]),
-    roleNamespace:
-      local role = k.rbac.v1.role;
-      local policyRule = role.rulesType;
-
-      local coreRule = policyRule.new() +
-                       policyRule.withApiGroups(['']) +
-                       policyRule.withResources([
-                         'nodes',
-                         'services',
-                         'endpoints',
-                         'pods',
-                       ]) +
-                       policyRule.withVerbs(['get', 'list', 'watch']);
-
-      role.new() +
-      role.mixin.metadata.withName('prometheus-' + $._config.prometheus.name) +
-      role.mixin.metadata.withNamespace($._config.namespace) +
-      role.withRules(coreRule),
     prometheus:
       local container = k.core.v1.pod.mixin.spec.containersType;
       local resourceRequirements = container.mixin.resourcesType;