Events flow http://pastebin.com/A6jWvdzD shows that something went completely wrong with HAproxy backends, many of them had been marked DOWN, so that was a root cause of "504 Gateway Time-out" as well.
Events flow http:// pastebin. com/A6jWvdzD shows that something went completely wrong with HAproxy backends, many of them had been marked DOWN, so that was a root cause of "504 Gateway Time-out" as well.