[google-appengine] Unable to export to Monitoring service because: GaxError RPC failed, caused by 3: One or more TimeSeries could not be written

I have a Python/ Django app on Flexible App Engine. On May 16, I started receiving these messages: Unable to export to Monitoring service because: GaxError RPC failed, caused by 3:One or more TimeSeries could not be written: Metrics cannot be written to gae_app. See

[google-appengine] Unable to export to Monitoring service because: GaxError RPC failed, caused by 3:One or more TimeSeries could not be written: Metrics cannot be written to gae_app.

I have a Python/ Django app deployed on Flexible App Engine. On May 16th, I started getting following error in the stackdriver_logging_agent: Unable to export to Monitoring service because: GaxError RPC failed, caused by 3:One or more TimeSeries could not be written: Metrics cannot be written