ID: 6149
Title: ps: The linux ps check CPU utilization calculation changed since 1.4.0p27
Component: Checks & agents
Level: 1
Class: Bug fix
Version: 1.6.0i1
The calculation of the CPU utilization of processes on linux systems was not taking the
number
of CPU cores into account for a long time. This results in CPU utilizations reported with
more
than 100%, up to 100%*CPU-cores. For example in case 3 processes use 3 of 6 cores at 100%,
this
resulted in a usage of 300%.
The intention of the change in 1.4.0p27 was to make the windows and linux ps checks both
take
the number of CPU cores into account and cap the usage at 100%. The problem with this
change is
that all possibly existing thresholds that have been configured for the old scheme will
not
work anymore with the new scheme.
We have now reverted the changes version 1.4.0p27 introduced to get the old behavior
back.
In a future release, we will finally make the switch to the new scheme. But this will be
done
in a compatible way where the already configured thresholds will still work.