When a tmux client detaches, it prints a message. This may be one
of:
detached (from session ...)
The client was detached normally.
detached and SIGHUP
The client was detached and its parent sent the SIGHUP
signal (for example with detach-client -P).
lost tty
The client's tty(4) or pty(4) was unexpectedly destroyed.
terminated
The client was killed with SIGTERM.
too far behind
The client is in control mode and became unable to keep up
with the data from tmux.
exited The server exited when it had no sessions.
server exited
The server exited when it received SIGTERM.
server exited unexpectedly
The server crashed or otherwise exited without telling the
client the reason.
