I highly encourage playing with the scripts, even though you run the risk of them being overwritten by an update. Just back them up and replace them if you think it's needed. If you have built or improved things, don't forget to share them with us on github: https://github.com/munin-monitoring/munin
When you set --upper-limit
to 100 and your value is 110, your graph will run to 110. If you add --rigid
, your graph scale will stay at 100, and the line will be clipped, which is what you wanted in this case.
Your mysql_slowqueries graph line should read something like (it puts a limit on 100):
echo 'graph_args --base 1000 -l 0 --upper-limit 100 --rigid'