Hey,
While seeing error logs I got this :
[error] 33#33: *157365 connect() failed (111: Connection refused) while connecting to upstream, client: 2134:6801:4027:81e::2014, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://<IP>:8080/favicon.ico", host: "<app>", referrer: "http://<app>.
appspot.com/"
Grafana by default listens on port 3000, so is it fine ? or should it be changed to 8080 ?