[metricbeat] Add priorityClassName config

metricbeat/README.md

@@ -92,6 +92,7 @@ helm install --name metricbeat elastic/metricbeat --set imageTag=7.5.1
 | `nodeSelector`           | Configurable [nodeSelector](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#nodeselector)                                                                                                                                                                                                             | `{}`                                                                                                                      |
 | `affinity`               | Configurable [affinity](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity)                                                                                                                                                                                                   | `{}`                                                                                                                      |
 | `updateStrategy`         | The [updateStrategy](https://kubernetes.io/docs/tasks/manage-daemon/update-daemon-set/#daemonset-update-strategy) for the `DaemonSet`. By default Kubernetes will kill and recreate pods on updates. Setting this to `OnDelete` will require that pods be deleted manually.                                              | `RollingUpdate`                                                                                                           |
+| `priorityClassName`      | The [name of the PriorityClass](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#priorityclass). No default is supplied as the PriorityClass must be created first.                                                                                                                            | `""`                                                                                                                      |
 | `replicas`               | The replica count for the metricbeat deployment talking to kube-state-metrics                                                                                                                                                                                                                                            | `1`                                                                                                                       |
 | `fullnameOverride`       | Overrides the full name of the resources. If not set the name will default to "`.Release.Name`-`.Values.nameOverride or .Chart.Name`"                                                                                                                                                                                    | `""`                                                                                                                      |
 
@@ -142,4 +143,4 @@ To run the goss tests against the default example:
 ```
 cd examples/default
 make goss
-```
+```

metricbeat/templates/daemonset.yaml

@@ -44,6 +44,9 @@ spec:
       {{- with .Values.nodeSelector }}
       nodeSelector: {{ toYaml . | nindent 8 }}
       {{- end }}
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName  }}
+      {{- end }}
       {{- with .Values.affinity }}
       affinity: {{ toYaml . | nindent 8 -}}
       {{- end }}

metricbeat/templates/deployment.yaml

@@ -35,6 +35,9 @@ spec:
       {{- with .Values.tolerations }}
       tolerations:
 {{ toYaml . | indent 6 }}
+      {{- end }}
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName  }}
       {{- end }}
       serviceAccountName: {{ template "metricbeat.serviceAccount" . }}
       terminationGracePeriodSeconds: {{ .Values.terminationGracePeriod }}

metricbeat/tests/metricbeat_test.py

@@ -207,6 +207,27 @@ def test_adding_an_affinity_rule():
     assert r['daemonset'][name]['spec']['template']['spec']['affinity']['podAntiAffinity'][
         'requiredDuringSchedulingIgnoredDuringExecution'][0]['topologyKey'] == 'kubernetes.io/hostname'
 
+
+def test_priority_class_name():
+    config = '''
+priorityClassName: ""
+'''
+    r = helm_template(config)
+    daemonset_spec = r['daemonset'][name]['spec']['template']['spec']
+    deployment_spec = r['deployment'][name + '-metrics']['spec']['template']['spec']
+    assert 'priorityClassName' not in daemonset_spec
+    assert 'priorityClassName' not in deployment_spec
+
+    config = '''
+priorityClassName: "highest"
+'''
+    r = helm_template(config)
+    daemonset_priority_class_name = r['daemonset'][name]['spec']['template']['spec']['priorityClassName']
+    deployment_priority_class_name = r['deployment'][name + '-metrics']['spec']['template']['spec']['priorityClassName']
+    assert daemonset_priority_class_name == "highest"
+    assert deployment_priority_class_name == "highest"
+
+
 def test_cluster_role_rules():
     config = ''
     r = helm_template(config)

metricbeat/values.yaml

@@ -180,6 +180,10 @@ nodeSelector: {}
 
 affinity: {}
 
+# This is the PriorityClass settings as defined in
+# https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#priorityclass
+priorityClassName: ""
+
 updateStrategy: RollingUpdate
 
 # Override various naming aspects of this chart