server stops accepting new connections

[dktr0]

This log message that appears a few minutes before last accepted connection is probably relevant: "Network.Socket.accept: resource exhausted (Too many open files)"

In which case, this discussion on an another project is probably relevant: PostgREST/postgrest#2042

[dktr0]

This is a useful Linux command for seeing how many files a process has open: sudo ls -lah /proc/PID/fd

The Haskell module System.Posix.Resource has functionality for querying this from within the server application itself: https://hackage.haskell.org/package/unix-2.8.0.0/docs/System-Posix-Resource.html

[dktr0]

Actually System.Posix.Resource seems to only provide functionality for querying the limits of open files, not the current number of open files...