proposal load-aware scheduling plugin

[eahydra]

Signed-off-by: Tao Li joseph.t.lee@outlook.com

Ⅰ. Describe what this PR does

Although Koordinator provides the co-location mechanism to improve the resource utilization of the cluster and reduce costs, it does not yet have the ability to control the utilization level of the cluster dimension. This proposal defines a scheduling plugin to help Koordinator achieve this capability.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[eahydra]

design for #95

/assign @hormes @allwmh @saintube

[hormes]

Ref #95

[codecov-commenter]

Codecov Report

Merging #135 (dd9a29c) into main (c722334) will decrease coverage by 0.92%.
The diff coverage is n/a.

❗ Current head dd9a29c differs from pull request most recent head ab5e1af. Consider uploading reports for the commit ab5e1af to get more accurate results

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   56.38%   55.45%   -0.93%     
==========================================
  Files          78       83       +5     
  Lines        7366     7787     +421     
==========================================
+ Hits         4153     4318     +165     
- Misses       2840     3086     +246     
- Partials      373      383      +10     

Flag	Coverage Δ
unittests	55.45% <ø> (-0.93%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...controller/noderesource/noderesource_controller.go	0.00% <0.00%> (ø)
...ontroller/noderesource/nodemetric_event_handler.go	0.00% <0.00%> (ø)
...controller/noderesource/configmap_event_handler.go	0.00% <0.00%> (ø)
...slo-controller/noderesource/resource_calculator.go	100.00% <0.00%> (ø)
pkg/slo-controller/noderesource/noderesource.go	0.00% <0.00%> (ø)
pkg/koordlet/resmanager/resmanager.go	56.69% <0.00%> (+2.67%)	⬆️
pkg/koordlet/resmanager/memory_evict.go	72.07% <0.00%> (+59.20%)	⬆️

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[eahydra]

@jasonliu747 @saintube I updated the proposal with extend NodeMetricSpec to support user-defined reporting period and aggregation period.

[jasonliu747]

lgtm overall. However, I think some variables can have a better naming. We can figure it out later. Others have any suggestions?
/lgtm

[hormes]

Please add a record in the section of unsolved problems to support portraits of different periods. For example, long-running pods need to be scheduled with long-period profiling, while short-period pods should be scheduled with short-period profiling.

[eahydra]

Please add a record in the section of unsolved problems to support portraits of different periods. For example, long-running pods need to be scheduled with long-period profiling, while short-period pods should be scheduled with short-period profiling.

Updated. @hormes

[saintube]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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