app.yaml

# App Engine runtime configuration
runtime: php73
instance_class: F1
service: default

# Defaults to "serve index.php" and "serve public/index.php". Can be used to
# serve a custom PHP front controller (e.g. "serve backend/index.php") or to
# run a long-running PHP script as a worker process (e.g. "php worker.php").
entrypoint: serve web/gae-app.php

automatic_scaling:
  target_cpu_utilization: 0.9
  max_concurrent_requests: 3
  target_throughput_utilization: 0.8 # multiply to max_concurrent_requests, if waiting requests are more a new instance will be spawned  
  min_instances: 0
  max_instances: 10
  max_pending_latency: 150ms # if requests wait more to be served, a new instance will be spawned
  min_pending_latency: 100ms # if requests can be served in less time, an instance will be shut down
  min_idle_instances: 0
  max_idle_instances: 1

includes:
  - env_variables.yaml
  - handlers.yaml