[http-add-on] Add topologySpreadConstraints to operator and scaler (#793)

* feat(http-add-on): add topologySpreadConstraints to operator

Signed-off-by: Starlight Romero <28881133+starlightromero@users.noreply.github.com>

* feat(http-add-on): add topologySpreadConstraints to scaler

Signed-off-by: Starlight Romero <28881133+starlightromero@users.noreply.github.com>

---------

Signed-off-by: Starlight Romero <28881133+starlightromero@users.noreply.github.com>

Author: starlightromero

.github/workflows/ci-http-add-on.yml

@@ -98,6 +98,26 @@ jobs:
             tag: canary
           rbac:
             aggregateToDefaultRoles: true
+          operator:
+            topologySpreadConstraints:
+              - maxSkew: 1
+                topologyKey: "kubernetes.io/hostname"
+                whenUnsatisfiable: "ScheduleAnyway"
+                labelSelector:
+                  matchLabels:
+                    app.kubernetes.io/component: operator
+                    app.kubernetes.io/instance: http-add-on
+                    app.kubernetes.io/name: http-add-on
+          scaler:
+            topologySpreadConstraints:
+              - maxSkew: 1
+                topologyKey: "kubernetes.io/hostname"
+                whenUnsatisfiable: "ScheduleAnyway"
+                labelSelector:
+                  matchLabels:
+                    app.kubernetes.io/component: operator
+                    app.kubernetes.io/instance: http-add-on
+                    app.kubernetes.io/name: http-add-on
           interceptor:
             replicas:
               min: 1

http-add-on/templates/operator/deployment.yaml

@@ -119,6 +119,10 @@ spec:
       tolerations:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- with .Values.operator.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- if .Values.operator.priorityClassName }}
       priorityClassName: {{ .Values.operator.priorityClassName }}
       {{- end }}

http-add-on/templates/scaler/deployment.yaml

@@ -111,6 +111,10 @@ spec:
       tolerations:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- with .Values.scaler.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- if .Values.scaler.priorityClassName }}
       priorityClassName: {{ .Values.scaler.priorityClassName }}
       {{- end }}

http-add-on/values.yaml

@@ -79,6 +79,8 @@ operator:
   tolerations: []
   # -- Affinity for pod scheduling ([docs](https://kubernetes.io/docs/tasks/configure-pod-container/assign-pods-nodes-using-node-affinity/))
   affinity: {}
+  # -- Topology spread constraints ([docs](https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/))
+  topologySpreadConstraints: []
   # -- Annotations to be added to the operator pods
   podAnnotations: {}
 
@@ -116,6 +118,8 @@ scaler:
   tolerations: []
   # -- Affinity for pod scheduling ([docs](https://kubernetes.io/docs/tasks/configure-pod-container/assign-pods-nodes-using-node-affinity/))
   affinity: {}
+  # -- Topology spread constraints ([docs](https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/))
+  topologySpreadConstraints: []
   resources:
     limits:
       cpu: 0.5