How can schedule stop-start of standard app engine in gcp

I was trying to find out a way to schedule stop/start the latest version of app engine in google cloud, but couldn't find any way for that. I just found gcloud command for stopping/starting a specific version, but don't know how can I schedule gcloud command.

We have manual scaling standard app engine , and I want to stop it every night at specific time, and re-start it again in morning.
What is the best way to do that?

My implemented solution is separate python cloud function for stopping and starting the app engine, then scheduling those functions at the specific time

https://cloud.google.com/appengine/docs/standard/python3/runtime#environment_variables

Thanks,

Finally I could disable/serving the app engine in cloud function, instead of stopping a specific version.

1- Creating a cloud function which is triggered by pub/sub

import os
from googleapiclient import discovery
from oauth2client.client import GoogleCredentials


def disableEnable(event, context):
   credentials = GoogleCredentials.get_application_default()
   appengine = discovery.build('appengine', 'v1', 
     credentials=credentials)
   apps = appengine.apps()
   APP_NAME = os.getenv("APP_NAME")
   messageServingStatus = event['message']

   # Get the target app's serving status
   target_app = apps.get(appsId=APP_NAME).execute()
   current_status = target_app['servingStatus']

   # Disable target app, if necessary
   if current_status == 'SERVING' and messageServingStatus == 'STOPPED':
     print(f'Attempting to disable app {APP_NAME}...')
     body = {'servingStatus': 'USER_DISABLED'}
   if current_status == 'USER_DISABLED' and messageServingStatus == 
     'SERVING':
     print(f'Attempting to enable app {APP_NAME}...')
     body = {'servingStatus': 'SERVING'}   
   apps.patch(appsId=APP_NAME, updateMask='serving_status', body=body).execute()

2-create two scheduler with specific frequency (FOR ENABLING/DISABLING appengine)
Target Type= Pub/Sub
Select created Pub/sub topic name

App Engine Standard is a serverless product managed by Google. It scales up and down (up to 0) automatically (in automatic and basic mode). In manual mode, the scaling is not so elastic, and you set the number of instances that you want, it's flat.

The power of App Engine is that elasticity. I use it only in automatic mode. There are some trade off like the start up time when you scale from 0 (also called cold start), and the instance live duration (that you don't manage, after a while with no request handling, the instance is offloaded).

But it also means you have nothing to manage to scale up and down. If there is traffic, you have instances. If you have nothing (the night) all the instance are shut down automatically and you pay nothing.

There are some counterpart, like the max duration of request processing, the incapacity to perform background processing and stuff like that.

Let us now more about your app constraint to review with you if app engine is the best fit for you.