The most immediate way to get hold of us is to join our IRC channel:
#munin on server irc.oftc.net
The main timezone of the channel is Europe+America.
If you can explain your problem in a few clear sentences, without too much copy&paste, IRC is a good way to try to get help. If you do need to paste log files, configuration snippets, scripts and so on, please use a pastebin.
If the channel is all quiet, try again some time later, we do have lives, families and jobs to deal with also.
You are more than welcome to just hang out, and while we don’t mind the occational intrusion of the real world into the flow, keep it mostly on topic, and dont paste random links unless they are really spectacular and intelligent.