Uwsgi logs in JSON format

uwsgi.ini

# add 'logfile' to the plugin list
plugins     = python3,logfile

# match logs already in json format
logger      = applogger stdio
log-route   = applogger ^{
log-encoder = format:applogger ${msg}
log-encoder = nl:applogger

# all other logs, we jsonify
logger      = default stdio
log-route   = default ^(?!\{)
log-encoder = json:default {"timestamp":"${strftime:%%Y-%%m-%%dT%%H:%%M:%%S}", "source":"uwsgi", "levelname":"INFO", "message":"${msg}"}
log-encoder = nl:default

It should be noted that this still won't do all logs - you'll get a few startup messages before the logging kicks in, which look like this:

[uWSGI] getting INI configuration from uwsgi.ini
[log-encoder] registered format:applogger ${msg}
[log-encoder] registered json:default {"timestamp":"${strftime:%Y-%m-%dT%H:%M:%S}", "source":"uwsgi", levelname:"INFO", "message":"${msg}"}
[log-encoder] registered nl:default