Errors are logged at /Error log
You can execute these commands by direct messaging MusikBot directly or in the #wikipedia-en-abuse-log-all connect channel. Your IRC handle must be identified (logged in) to (un)subscribe to filters. Your subscriptions are not publicly viewable. Except for the ping command, MusikBot will only reply by messaging you directly.
!subscribe en.wikipedia.org [filter id]— Get direct private messages of hits to the given filter.
!unsubscribe en.wikipedia.org [filter id]— Unsubscribe to the given filter.
!unsubscribe en.wikipedia.org all— Unsubscribe to all filters.
!subscriptions en.wikipedia.org— List all of your subscriptions.
!subscriptions— List all of your subscriptions, across all wikis.
!ping— If the bot is running properly it should reply with "Pong.".
en.wikipedia.org with the desired wiki.
You can also get notifications by adding "highlight words" to your IRC client, such as
*filter-123*. The asterisks are necessary to avoid conflicts (e.g. getting notified for filter 123 when you subscribed to 12). The dash is present because some IRC clients use spaces to separate highlight words.
Subscribing a channel to filter hits
You can subscribe a channel to filter hits using the same commands above, but appending the channel name. For example, to subscribe #example to filter 123 on Commons, use:
!subscribe commons.wikipedia.org 123 #example
This functionality requires that you be ops in the given channel.