We’ve just started using PMM2 (yes yes, we took a long time to upgrade from version 1!!).
The metrics seem to be color coded - green, yellow, and red - which I assume means the values are within specific ranges. But I can’t always tell what the thresholds are or what they mean.
Can anyone help me understand what " “Top InnoDB I/O Data Reads” is ? And in general I’m not clear what the “Top” metrics mean - Top of what? =)