Alexey Bezhan 676e3ec39a Stream delivery worker logs to stdout when running on PaaS ...

Our application servers and celery workers write logs both to a
file that is shipped to CloudWatch and to stdout, which is picked
up by CloudFoundry and sent to Logit Logstash.

This works with gunicorn and single-worker celery deployments, however
celery multi daemonizes worker processes, which detaches them from
stdout, so there's no log output in `cf logs` or Logit.

To fix this, we start a separate tail process to duplicate logs written
to a file to stdout, which should be picked up by CloudFoundry.

2018-06-29 11:49:02 +01:00

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