microservices/classroom_notification_service/kustomize/custom/hpa.yaml

# Copyright 2023 Google LLC
#
# 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/v2
kind: HorizontalPodAutoscaler
metadata:
  name: classroom-notification-service
spec:
  minReplicas: 3
  maxReplicas: 5
  metrics:
  - external:
      metric:
        name: pubsub.googleapis.com|subscription|num_undelivered_messages
        selector:
          matchLabels:
            resource.labels.subscription_id: classroom-notifications-sub
      target:
        averageValue: "2"
        type: AverageValue
    type: External
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: classroom-notification-service