Configuring Logging and Monitoring

log_format json_combined escape=json
  '{"ts":"$time_iso8601",'
  '"remote_addr":"$remote_addr",'
  '"method":"$request_method",'
  '"path":"$uri",'
  '"status":$status,'
  '"bytes":$body_bytes_sent,'
  '"rt":$request_time,'
  '"ua":"$http_user_agent",'
  '"req_id":"$request_id",'
  '"upstream_status":"$upstream_status"}';
access_log /var/log/nginx/access.json json_combined;

String requestId = request.getHeader("X-Request-Id");
if (requestId == null) requestId = UUID.randomUUID().toString();
MDC.put("request_id", requestId);
response.setHeader("X-Request-Id", requestId);
// Forward to upstream
upstreamRequest.setHeader("X-Request-Id", requestId);