nginx_log.conf

log_format                      le_json  '{'
                                    '"created_at": "$time_iso8601", '
                                    '"remote_addr": "$remote_addr", '
                                    '"remote_user": "$remote_user", '
                                    '"request": "$request", '
                                    '"request_method": "$request_method", '
                                    #'"postdata" : "$request_body", '
                                    '"request_response_time": "$request_time", '
                                    '"upstream_response_time": "$upstream_response_time", '
                                    '"upstream_addr": "$upstream_addr", '
                                    '"body_bytes_sent": $body_bytes_sent, '
                                    '"msec": "$msec", '
                                    '"status": "$status", '
                                    '"http_referrer": "$http_referer", '
                                    '"platform": "$upstream_http_x_platform", '
                                    '"chcount": "$upstream_http_x_chcount", '
                                    '"device": "$upstream_http_x_device", '
                                    '"http_user_agent": "$http_user_agent"' '}';

access_log                      /var/log/nginx/access_upstream.log le_json;
error_log                       /var/log/nginx/error.log;
rewrite_log