feat(core): add descheduler component to automatically rebalance virtual machines (VMs) across cluster nodes (#962)

Signed-off-by: Yaroslav Borbat <yaroslav.borbat@flant.com>

Author: yaroslavborbat

templates/descheduler/descheduler.yaml

@@ -0,0 +1,26 @@
+{{- if (lookup "apiextensions.k8s.io/v1" "CustomResourceDefinition" "" "deschedulers.deckhouse.io") }}
+apiVersion: deckhouse.io/v1alpha2
+kind: Descheduler
+metadata:
+  name: virtualization
+  {{- include "helm_lib_module_labels" (list .) | nindent 2 }}
+spec:
+  evictLocalStoragePods: true
+  podLabelSelector:
+    matchExpressions:
+      - key: vm.kubevirt.internal.virtualization.deckhouse.io/name
+        operator: Exists
+  strategies:
+    lowNodeUtilization:
+      enabled: true
+      thresholds:
+        cpu: 50
+      targetThresholds:
+        cpu: 80
+    removePodsViolatingInterPodAntiAffinity:
+      enabled: true
+    removePodsViolatingNodeAffinity:
+      enabled: true
+      nodeAffinityType:
+        - requiredDuringSchedulingIgnoredDuringExecution
+{{- end }}