With dev_appserver.py, I run the demo program from the https://cloud.google.com/appengine/docs/flexible/go/how-requests-are-handled documentation

app.yaml:

runtime: go env: flex 

Everything works, but every time I get a warning:

WARNING 2019-02-17 20: 15: 06,765 application_configuration.py:170] The Managed VMs runtime is deprecated, please consider using the Flexible Runtime. See https://cloud.google.com/appengine/docs/flexible/python/migrating for more details.

What is the problem and how to fix it?

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