feat(gateway): add JSON log format for nginx access logs

gateway/nginx/nginx.conf

@@ -63,5 +63,23 @@ http {
         ''      '';
     }
 
+    log_format nginxlog_json escape=json '{ "timestamp": "$time_iso8601", '
+    '"remote_addr": "$remote_addr", '
+      '"body_bytes_sent": $body_bytes_sent, '
+      '"request_time": $request_time, '
+      '"response_status": $status, '
+      '"request": "$request", '
+      '"request_method": "$request_method", '
+      '"host": "$host",'
+      '"upstream_addr": "$upstream_addr",'
+      '"http_x_forwarded_for": "$http_x_forwarded_for",'
+      '"http_referrer": "$http_referer", '
+      '"http_user_agent": "$http_user_agent", '
+      '"http_version": "$server_protocol", '
+      '"request_id": "$request_id", '
+      '"nginx_access": true }';
+
+    access_log /dev/stdout nginxlog_json;
+
     include /etc/nginx/conf.d/*.conf;
 }