Automatic merge from submit-queue
[GarbageCollector] add absent owner cache
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**What this PR does / why we need it**:
Reducing the Request sent to the API server by the garbage collector to check if an owner exists.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
#26120
**Special notes for your reviewer**:
**Release note**:
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```release-note
```
Currently when processing an item in the dirtyQueue, the garbage collector issues GET to check if any of its owners exist. If the owner is a replication controller with 1000 pods, the garbage collector sends a GET for the RC 1000 times. This PR caches the owner's UID if it does not exist according to the API server. This cuts 1/3 of the garbage collection time of the density test in the gce-500 and gce-scale, where the QPS is the bottleneck.
Automatic merge from submit-queue
[GarbageCollector] measure latency
First commit is #27600.
In e2e tests, I measure the average time an item spend in the eventQueue(~1.5 ms), dirtyQueue(~13ms), and orphanQueue(~37ms). There is no stress test in e2e yet, so the number may not be useful.
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Automatic merge from submit-queue
pkg/controller/garbagecollector: simplify mutexes.
pkg/controller/garbagecollector: simplified synchronization and made idiomatic.
Similar to #29598, we can rely on the zero-value construction behavior
to embed `sync.Mutex` into parent structs.
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Kubernetes Submit Queue
Chao Xu
jianhuiz
Timothy St. Clair
deads2k
Matt T. Proud
k8s-merge-robot
lixiaobing10051267
Wojciech Tyczynski
David McMahon
