Find a way to reduce duplicate log messages

[rumpelsepp]

Several helpers are called multiple times and they tend to log the same warnings over and over again. Find a way to silence them. Maybe the penlog module needs a log_once() function or similar. Have a look at systemd; they have an implementation of such a function.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.