Our IRC channel - #OpenMRS on irc.freenode.net - is continually logged, and these archives are updated hourly. All logs are searchable and individual messages can be linked to from e-mail, IM, etc.
Since 2014, our IRC channels are logged 24/7 by BotBot in case you miss anything.
Due to many factors, Botbot was shutdown on November 5, 2018.
We now have Logbot to log IRC activity.