Add http_x_amzn_trace_id to json logging (for X-Amzn-Trace-Id header)

https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-request-tracing.html

Author: itskingori

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## 1.19.5-5
 
+* Add `http_x_amzn_trace_id` to json logging (for `X-Amzn-Trace-Id` header).
 * Add `http_connection` to json logging (for `Connection` header).
 * Fix "incorrect" spelling of header.
 

config/log.conf

@@ -10,6 +10,7 @@ log_format main_json escape=json
     '"http_connection":"$http_connection",'
     '"http_referer":"$http_referer",'
     '"http_user_agent":"$http_user_agent",'
+    '"http_x_amzn_trace_id":"$http_x_amzn_trace_id",'
     '"http_x_forwarded_for":"$http_x_forwarded_for",'
     '"proxy_x_forwarded_port":"$proxy_x_forwarded_port",'
     '"proxy_x_forwarded_proto":"$proxy_x_forwarded_proto",'