feat(router) nginx status; log http_host, upstream and request times

Improve debug and monitoring

When a request come to Deis for an old removed app the request returns 200 making it hard to detect problems, the http_host in the log can help us check if an app exists, upstream and request times helps to detect buggy apps and/or units, stub_status makes possible to check routers balancing and total connections

Author: Leonardo Lorieri

router/image/templates/nginx.conf

@@ -44,7 +44,7 @@ http {
 
     client_max_body_size {{ or (.deis_router_bodySize) "1m" }};
 
-    log_format upstreaminfo '[$time_local] - $remote_addr - $remote_user - $status - "$request" - $bytes_sent - "$http_referer" - "$http_user_agent" - "$server_name" - $upstream_addr';
+    log_format upstreaminfo '[$time_local] - $remote_addr - $remote_user - $status - "$request" - $bytes_sent - "$http_referer" - "$http_user_agent" - "$server_name" - $upstream_addr - $http_host - $upstream_response_time - $request_time';
 
     # send logs to STDOUT so they can be seen using 'docker logs'
     access_log /opt/nginx/logs/access.log upstreaminfo;
@@ -181,6 +181,9 @@ http {
             access_log off;
             return 200;
         }
+        location /router-nginx-status {
+            stub_status on;
+        }
     }
 }