nginx json logs

log_format json_combined escape=json '{ "created_at": "$msec", '

            '"remote_addr": "$remote_addr", '

            '"remote_user": "$remote_user", '

            '"request": "$request", '

            '"status": $status, '

            '"bytes_sent": $bytes_sent, '

            '"request_length": $request_length, '

            '"request_time": $request_time, '

            '"http_referrer": "$http_referer", '

            '"http_x_forwarded_for": "$http_x_forwarded_for", '

            '"http_user_agent": "$http_user_agent" }';

access_log  /var/log/nginx/access.log  json_combined;