twm: Yes, thanks. I learned this after some code digging. I sent an email about logging to the mailinglist
I'm wondering if I perhaps think twisted have a logging level too little: There is debug-info-warn-error-critical. I have a use case for one extra inbetween info and warn, similar to syslog "notice":
debug is, well debug message. info, is the most verbose non-debug level. Some types of imfo messages are more important than others, e.g. "connected to". But they are not warnings, so they ought to sit in a level inbetween. Ergo notice :D