- Sometimes, the scheduler incorrectly placed a pod in the "unschedulable" queue instead of the "backoff" queue. This happened when some plugin previously declared the pod as "unschedulable" and then in a later attempt encounters some other error. Scheduling of that pod then got delayed by up to five minutes, after which periodic flushing moved the pod back into the "active" queue. ([#120334](https://github.com/kubernetes/kubernetes/pull/120334), [@pohly](https://github.com/pohly))...

github.com/eapache/go-xerial-snappy v0.0.0-20230731223053-c322873962e3/go.mod h1:YvSRo5mw33fLEx1+DlK6L2VV43tJt5Eyel9n9XBcR+0=
github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc=
github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
github.com/eclipse/paho.mqtt.golang v1.5.0 h1:EH+bUVJNgttidWFkLLVKaQPGmkTUfQQqjOsyvMGvD6o=

- Fixes the bug in PodTopologySpread that only happens with QHint enabled, 

- Previously, the scheduling queue didn't notice any extenders' failures, potentially resulting in missed cluster events and Pods rejected by Extenders being stuck in the unschedulable pod pool for up to 5 minutes in the worst-case scenario. Now, the scheduling queue notices extenders' failures and requeues Pods rejected by Extenders appropriately.

- Sometimes, the scheduler incorrectly placed a pod in the "unschedulable" queue instead of the "backoff" queue. This happened when some plugin previously declared the pod as "unschedulable" and then in a later attempt encounters some other error. Scheduling of that pod then got delayed by up to five minutes, after which periodic flushing moved the pod back into the "active" queue. ([#120334](https://github.com/kubernetes/kubernetes/pull/120334), [@pohly](https://github.com/pohly))...

### **Instrumentation**

#### **Audit**

*   Adjust batching audit webhook default parameters: increase queue size, batch size, and initial backoff. Add throttling to the batching audit webhook. Default rate limit is 10 QPS. ([#53417](https://github.com/kubernetes/kubernetes/pull/53417),[ @crassirostris](https://github.com/crassirostris))

- Fixed a panic in `kubectl exec` when the terminal size queue delegate is uninitialized. ([#136280](https://github.com/kubernetes/kubernetes/pull/136280), [@seekskyworld](https://github.com/seekskyworld)) [SIG CLI]

rGåY~[MNØÜŸ²"sÕxªA^f„UÐaDEDKG¤QZªk |{ywH’}nTû cn%1òr² p ¢ ) ª¿E"³²zaöñ q„ãZ`\Agzc¨Üyª|\ir VgYò°¼8ïvNo^]}Z{¾zìûzf€GN[Ö9~s þû\²xFñ&{gzQUx )lRiJ ò}spXMªmãÌÖ]O_¦Gw{tyrcWûòr²~kÕ 2J­²*}yFºÈøq¬ÖÇôgGGCªTñ|eq 0cJòIûT 5Œ´Bóê \e>Ö }J8/Ö=_pOŠGxËæAXcÖ=@e ŒNrA,ÿ°S}€TÅ>ôkDyó~¾ÈgMY]Èues`B>Dc¼u`÷HCfK¢tc¾hEÂiK@¦\O\Iý_K¢yzUx:iDgDW®Ê \u{Óý2¬+U÷u¾reôi}OO¸}KA zoZŠ|e¼~m\}D îˆtÚ÷ cYr¾sqPwÐÚ² RoUJt‹8wÖGFgò3²L /ìAyÜ×Ùè¤}ZÚ DmziATÜE¾yZT÷ågK{ NevC2ö§ª›0²W# ZDitŠts¤G_ï¬Di K|}û~¾GHrMNsn4Ês#ÆÏÅ PVWu»E}ˆWyáÂ>p{Æu²EÊiBñ†iAIeq˺Nm²BæKªHiTIxÂŽ~g^qK...

- Added `SchedulerPopFromBackoffQ` feature gate that is in beta and enabled by default. Improved scheduling queue behavior by popping pods from the backoffQ when the activeQ is empty. This allows to process potentially schedulable pods ASAP, eliminating a penalty effect of the backoff queue. ([#130772](https://github.com/kubernetes/kubernetes/pull/130772), [@macsko](https://github.com/macsko)) [SIG Scheduling and Testing]

    - `scheduler_async_api_call_duration_seconds`: histogram of API call execution duration by call type and result
    - `scheduler_pending_async_api_calls`: gauge showing current number of pending API calls in the queue. ([#133120](https://github.com/kubernetes/kubernetes/pull/133120), [@utam0k](https://github.com/utam0k)) [SIG Release and Scheduling]