title: How to use Stackdriver Structured Logging in App Engine Flex Java environment
body: <p>Google App Engine flexible environment automatically pipes stdout and stderr to Stackdriver (Google Cloud Logging). But this only supports plain text log message without any metadata (not even logging levels).</p>
  
  <p>I found Logback appender for google cloud logging.</p>
  
  <p><a href="https://cloud.google.com/logging/docs/setup/java" rel="nofollow noreferrer">https://cloud.google.com/logging/docs/setup/java</a></p>
  
  <p>But this does not seem to support structured logging yet.
  And also, it makes GRPC calls for every log entry under the hood. So, I wonder how scalable it is (especially compare to current app engine structure which has separate Fluentd agent handles logs).</p>
  
  <p>Is there any out of box or simple solution to send structured log from App Engine to Stackdriver?</p>