This means that they'll be interrupted at shutdown, rather than holding everything up when shuckle is overloaded.
We also detect idle connection or slow transmitting data.
Triggered by investigating
xmon: could not read message type: unexpected EOF, will reconnect
xmon: connected to xmon REDACTED
Undertaker: hard abort - running abort handlers
Uncaught exception thrown: SyscallException(Xmon.cpp@186, 9/EBADF=Bad file descriptor in void Xmon::run()): setsockopt
which caused crashes in shards/CDC.