Variable logs in rule engine?

I have a true/false variable in a few rules that has gone blank.
None of the rules set the variable to blank, and they rely on the variable = either true or false.

What would cause this?
And is there a way to see the logs of a variable, without looking at the logs of every rule?

Going through the rule logs, the variable is never set to blank.

Thanks in advance

Hi David-
Logs are currently available per Rule – we don’t currently have logs on the Variables. Can you PM me the name of the variable? I’d like to take a closer look and see if I can find any clues. If you have a rough idea of the time or time-range that the issue might have occurred (and the timezone), that would help as well!