[lxc-users] Why does lxc-monitor insist on logging to a file?

[Forest]

I am not passing any command line options to lxc-monitor, and its manual
says, "The default is no log."  Nevertheless, whenever I run it,
lxc-monitord writes to lxc-monitord.log.

I have tools that regularly use lxc-monitor, and this log file has been
slowly growing in size for who knows how long.  Passing -o /dev/null doesn't
help.  How can I banish this file?

$ lxc-monitor --version
3.0.4