Add hpa for ceilometer and set replica as 1

Change-Id: I2af8547a7fd4babf432a7ce19735528f4ad5c948

openstack_operator/ceilometer.py

@@ -29,3 +29,4 @@ def create_or_resume(spec):
     utils.create_or_update('ceilometer/secret.yml.j2', spec=spec)
     utils.create_or_update('ceilometer/deployment-agent-notification.yml.j2',
                            spec=spec, config_hash=config_hash)
+    utils.create_or_update('ceilometer/horizontalpodautoscaler.yml.j2')

openstack_operator/templates/ceilometer/deployment-agent-notification.yml.j2

@@ -21,7 +21,7 @@ metadata:
   labels:
     {{ labels("ceilometer", "ceilometer") | indent(4) }}
 spec:
-  replicas: 3
+  replicas: 1
   selector:
     matchLabels:
       {{ labels("ceilometer", "ceilometer") | indent(6) }}

openstack_operator/templates/ceilometer/horizontalpodautoscaler.yml.j2

@@ -0,0 +1,30 @@
+---
+# Copyright 2020 VEXXHOST, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: ceilometer
+  namespace: openstack
+  labels:
+    {{ labels("ceilometer", "ceilometer") | indent(4) }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: ceilometer-agent-notification
+  minReplicas: 1
+  maxReplicas: 10
+  targetCPUUtilizationPercentage: 90