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We should not proceed and send client reload events until we know that all of the server processes have updated to the latest version, or they may reload into the old server version if they hit a Django worker which has not yet restarted. Because the logic controlling the number of workers is mildly complex, and lives in Puppet, use the `uwsgi` Python bindings to know when the process being reloaded is the last one, and use that to write out a file signifying the success of the chain reload. `restart-server` awaits the creation of this file before proceeding.