Set Container Resources In Helm Chart

Prior to this commit the helm chart used to install the descheduler
CronJob did not set container requests or limits. This is considered
an anti-pattern when deploying applications on k8s.

Set descheduler container resources to make it a burstable pod. This
will ensure a high quality experience for end users when deploying
descheduler into their clusters using the instructions from the README.

The default values choosen for CPU/Memory are not based on any real data.

charts/descheduler/README.md

@@ -56,5 +56,7 @@ The following table lists the configurable parameters of the _descheduler_ chart
 | `priorityClassName`            | The name of the priority class to add to pods                                                                         | `system-cluster-critical`            |
 | `rbac.create`                  | If `true`, create & use RBAC resources                                                                                | `true`                               |
 | `podSecurityPolicy.create`     | If `true`, create PodSecurityPolicy                                                                                   | `true`                               |
+| `resources.cpuRequest`        | Descheduler container CPU request                                                                  | `500m`                               |
+| `resources.memoryRequest`        | Descheduler container memory request                                                                  | `256Mi`                               |
 | `serviceAccount.create`        | If `true`, create a service account for the cron job                                                                  | `true`                               |
 | `serviceAccount.name`          | The name of the service account to use, if not set and create is true a name is generated using the fullname template | `nil`                                |

charts/descheduler/templates/cronjob.yaml

@@ -44,6 +44,8 @@ spec:
                 - {{ $value | quote }}
                 {{- end }}
                 {{- end }}
+              resources:
+                {{- toYaml .Values.resources | nindent 16 }}
               volumeMounts:
                 - mountPath: /policy-dir
                   name: policy-volume

charts/descheduler/values.yaml

@@ -8,6 +8,14 @@ image:
   tag: ""
   pullPolicy: IfNotPresent
 
+resources:
+  requests:
+    cpu: 500m
+    memory: 256Mi
+  # limits:
+  #   cpu: 100m
+  #   memory: 128Mi
+
 nameOverride: ""
 fullnameOverride: ""