[8.12] [monitoring] Revert CPU Usage rule changes (#172913) #172959
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Reverts elastic#159351 Reverts elastic#167244 Due to the many unexpected issues that these changes introduced we've decided to revert these changes until we have better solutions for the problems we've learnt about. Problems: - Gaps in data cause alerts to fire (see next point) - Normal CPU rescaling causes alerts to fire elastic#160905 - Any error fires an alert (since there is no other way to inform the user about the problems faced by the rule executor) - Many assumptions about cgroups only being for container users are wrong To address some of these issues we also need more functionality in the alerting framework to be able to register secondary actions so that we may trigger non-oncall workflows for when a rule faces issues with evaluating the stats. Original issue elastic#116128 (cherry picked from commit 55bc6d5)
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