hackage-server unresponsive

[phadej]

It takes a long time to serve pages. It doesn't timeout, but the delays are very noticeable. This started happening few days ago. Is there some hiccups in the system?

[Bodigrim]

I was told that we think that some background process causes FD exhaustion (see #1463 for example). I looked for potential causes a few weeks ago, but didn't spot anything suspicious aside of #1451.