Add feature gates for KEP-5647

Author: michaelasp

content/en/docs/reference/command-line-tools-reference/feature-gates/AtomicFIFO.md

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+---
+title: AtomicFIFO
+content_type: feature_gate
+
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: beta
+    defaultValue: true
+    fromVersion: "1.36"
+
+---
+A client-go implementation of a FIFO queue that uses atomic operations to ensure events that come in
+batches, such as those from a ListAndWatch call, are processed in a single chunk. This is in contrast to
+the previous implementation which would process these events one by one, potentially causing the internal
+cache to become temporarily inconsistent with the API server. This feature gate can be toggled in the
+kube-controller-manager and any client-go based controller.

content/en/docs/reference/command-line-tools-reference/feature-gates/StaleControllerConsistencyDaemonset.md

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+---
+title: StaleControllerConsistencyDaemonset
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: beta
+    defaultValue: true
+    fromVersion: "1.36"
+---
+A kube-controller-manager flag that enables the daemonset controller to ensure that prior writes to
+the API server are observed before proceeding with additional reconciliation for the same daemonset.
+This is to prevent stale cache from causing incorrect or spurious updates to the daemonset.

content/en/docs/reference/command-line-tools-reference/feature-gates/StaleControllerConsistencyJob.md

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+---
+title: StaleControllerConsistencyJob
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: beta
+    defaultValue: true
+    fromVersion: "1.36"
+---
+A kube-controller-manager flag that enables the job controller to ensure that prior writes to
+the API server are observed before proceeding with additional reconciliation for the same job.
+This is to prevent stale cache from causing incorrect or spurious updates to the job.

content/en/docs/reference/command-line-tools-reference/feature-gates/StaleControllerConsistencyReplicaSet.md

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+---
+title: StaleControllerConsistencyReplicaSet
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: beta
+    defaultValue: true  
+    fromVersion: "1.36"
+---
+A kube-controller-manager flag that enables the replicaset controller to ensure that prior writes to
+the API server are observed before proceeding with additional reconciliation for the same replicaset.
+This is to prevent stale cache from causing incorrect or spurious updates to the replicaset.

content/en/docs/reference/command-line-tools-reference/feature-gates/StaleControllerConsistencyStatefulSet.md

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+---
+title: StaleControllerConsistencyStatefulSet
+content_type: feature_gate
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: beta
+    defaultValue: true
+    fromVersion: "1.36"
+---
+A kube-controller-manager flag that enables the statefulset controller to ensure that prior writes to
+the API server are observed before proceeding with additional reconciliation for the same statefulset.
+This is to prevent stale cache from causing incorrect or spurious updates to the statefulset.

content/en/docs/reference/command-line-tools-reference/feature-gates/UnlockWhileProcessingFIFO.md

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+---
+title: UnlockWhileProcessingFIFO
+content_type: feature_gate
+
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: beta
+    defaultValue: true
+    fromVersion: "1.36"
+---
+
+Client-go FIFO queue that unlocks while processing events. Previously, the queue would hold the lock for the entire duration of processing events, which could lead to performance issues in high-throughput scenarios. This feature gate can be toggled in the kube-controller-manager and any client-go based controller.