I'm trying to configure Jenkins loggers like the following:

• Log Warnings and up by default
• For certain spammy loggers I don't care about (like node monitors), require those to be ERROR before they show up to reduce the amount of log spam.

It doesn't seem to be possible:

If you have multiple entries, a log entry that matches any of them will be collected.

In general, it seems like a good idea to start by including everything in a certain log, and then excluding known issues and false positives in specific loggers.