In some cases it might be usefull to limit how many evictions per a
domain can be performed. To avoid burning the whole per descheduling
cycle budget. Limiting the number of evictions per node is a
prerequisite for evicting pods whose usage can't be easily subtracted
from overall node resource usage to predict the final usage. E.g. when a
pod is evicted due to high PSI pressure which takes into account many
factors which can be fully captured by the current predictive resource
model.
When checking for node limit getting exceeded the pod eviction
never fails. Thus, ignoring the metric reporting when a pod fails
to be evicted due to node limit constrains.
The error also allows plugin to react on other limits getting
exceeded. E.g. the limit on the number of pods evicted per namespace.
* feat: profile name for pods_evicted metric
Support new label "profile" for "pods_evicted" metric to allow
understand which profiles are evicting more pods, allowing better
observability
* refactor: evictoptions improved observability
Send profile and strategy names for EvictOptions, allowing Evictors to
access observability information
* cleanup: remove unnecessary evictoption reference
* feat: evictoptions for nodeutilzation
Explicit usage of options when invoking evictPods from the helper
function from nodeutilization for both highnodeutilization and
lownodeutilization
* Remove log level from Errors
Every error printed via Errors is expected to be important and always
printable.
* Invoke first Deschedule and then Balance extension points (breaking change)
* Separate plugin arg conversion from pluginsMap
* Seperate profile population from plugin execution
* Convert strategy params into profiles outside the main descheduling loop
Strategy params are static and do not change in time.
* Bump the internal DeschedulerPolicy to v1alpha2
Drop conversion from v1alpha1 to internal
* add tests to v1alpha1 to internal conversion
* add tests to strategyParamsToPluginArgs params wiring
* in v1alpha1 evictableNamespaces are still Namespaces
* add test passing in all params
Co-authored-by: Lucas Severo Alves <lseveroa@redhat.com>
