Running agents on all nodes.

Using a node selector can not run the prometheus-process-exporter
on the master node. So, This PS changes the scheduling to use
either taint/toleration or the node selector.

Change-Id: Ie84b2d2e0354fa927c1010c18392667dad171483

prometheus-process-exporter/templates/daemonset.yaml

@@ -52,8 +52,12 @@ spec:
 {{ tuple $envAll "process_exporter" "metrics" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 8 }}
     spec:
       serviceAccountName: {{ $serviceAccountName }}
+{{ if .Values.pod.tolerations.process_exporter.enabled }}
+{{ tuple $envAll "process_exporter" | include "helm-toolkit.snippets.kubernetes_tolerations" | indent 6 }}
+{{ else }}
       nodeSelector:
         {{ .Values.labels.process_exporter.node_selector_key }}: {{ .Values.labels.process_exporter.node_selector_value }}
+{{ end }}
       hostNetwork: true
       hostPID: true
       initContainers:

prometheus-process-exporter/values.yaml

@@ -79,6 +79,14 @@ pod:
         limits:
           memory: "1024Mi"
           cpu: "2000m"
+  tolerations:
+    process_exporter:
+      enabled: false
+      tolerations:
+      - key: node-role.kubernetes.io/master
+        operator: Exists
+      - key: node-role.kubernetes.io/node
+        operator: Exists
 
 dependencies:
   dynamic: