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Please describe your requested enhancement. Good feature requests will solve common problems or enable new use cases.

It is mentioned in the following Google Cloud documentation https://cloud.google.com/logging/docs/setup/php#gae-config that in order to configure the daemon for App Engine flexible environment, the corresponding app.yaml needs to add this parameter "enable_stackdriver_integration: true" under the "runtime_config" section.  It will be assume that this feature will work for every PHP runtime version supported by Google Cloud, but this feature is currently working on PHP version 7.3 and earlier as outlined here https://cloud.google.com/appengine/docs/flexible/php/runtime#runtime_config-section

What you would like to accomplish: To be able to use "enable_stackdriver_integration: true" in higher PHP versions than 7.3

How this might work: By simply adding "enable_stackdriver_integration: true" under "runtime_config" for newer PHP versions in the app.yaml configuration file.

If applicable, reasons why alternative solutions are not sufficient: it would be better to have an official and supported way to accomplish this without the need of an unsupported workaround/s

Other information (workarounds you have tried, documentation consulted, etc):
https://github.com/GoogleCloudPlatform/buildpacks/issues/396