The bug has been fixed for 8.04, although the changelog is missing the LP#:
munin (1.2.5-2ubuntu3.2) hardy; urgency=low * Added patch to fix irqstats using the 2.6.24 kernel. -- Chuck Short <email address hidden> Tue, 30 Jun 2009 10:34:39 -0400
And /usr/share/munin/plugins/irqstats is indeed working correctly with 2.6.24 now.
The bug has been fixed for 8.04, although the changelog is missing the LP#:
munin (1.2.5-2ubuntu3.2) hardy; urgency=low
* Added patch to fix irqstats using the 2.6.24 kernel.
-- Chuck Short <email address hidden> Tue, 30 Jun 2009 10:34:39 -0400
And /usr/share/ munin/plugins/ irqstats is indeed working correctly with 2.6.24 now.