- kubeadm: promoted feature gate `EtcdLearnerMode` to GA. Learner mode in etcd deployed by kubeadm is now locked to enabled by default. ([#126374](https://github.com/kubernetes/kubernetes/pull/126374), [@pacoxu](https://github.com/pacoxu)) [SIG Cluster Lifecycle]

    return new SingletonImmutableSet<>(e1);
  }

  /*
   * TODO: b/315526394 - Skip the Builder entirely for the of(...) methods, since we don't need to
   * worry that we might trigger the fallback to the JDK-backed implementation? (The varargs one
   * _could_, so we could keep it as it is. Or we could convince ourselves that hash flooding is
   * unlikely in practice there, too.)
   */

  /**

- '`CSIMigrationvSphere` was upgraded to GA and locked to true. Do not upgrade to K8s
  1.26 if you need Windows, or XFS, or raw block support until vSphere CSI Driver
  adds support for them in a version post v2.7.x.'

An unsuccessful call has no synchronizing effect at all.
As far as the memory model is concerned,
<code>l.TryLock</code> (or <code>l.TryRLock</code>)
may be considered to be able to return false
even when the mutex <i>l</i> is unlocked.
</p>

<h3 id="once">Once</h3>

<p>
The <code>sync</code> package provides a safe mechanism for
initialization in the presence of multiple goroutines
through the use of the <code>Once</code> type.

          readCount.set(0);
        } finally {
          unlock();
        }
      }
    }

    void runUnlockedCleanup() {
      // locked cleanup may generate notifications we can send unlocked
      if (!isHeldByCurrentThread()) {
        map.processPendingNotifications();
      }
    }
  }

### Other notable changes

* Fix watch cache filtering ([#28967](https://github.com/kubernetes/kubernetes/pull/28967), [@liggitt](https://github.com/liggitt))
* Fix problems with container restarts and flocker ([#25874](https://github.com/kubernetes/kubernetes/pull/25874), [@simonswine](https://github.com/simonswine))



# v1.2.5

		if err != nil {
			bugLogIf(ctx, err)
			return nil
		}
		return out
	}
}

func bytesToPublicKey(pub []byte) (*rsa.PublicKey, error) {
	block, _ := pem.Decode(pub)
	if block != nil {
		pub = block.Bytes
	}
	key, err := x509.ParsePKCS1PublicKey(pub)
	if err != nil {
		return nil, err
	}
	return key, nil
}

- Unlocked the `CSIMigrationvSphere` feature gate.
  The change allow users to continue using the in-tree vSphere driver,pending a vSphere
  CSI driver release that has with GA support for Windows, XFS, and raw block access. ([#116342](https://github.com/kubernetes/kubernetes/pull/116342), [@msau42](https://github.com/msau42)) [SIG Storage]

- kube-apiserver: Promoted the  `ServiceAccountTokenNodeBinding` feature gate general availability. It is now locked to enabled. ([#129591](https://github.com/kubernetes/kubernetes/pull/129591), [@liggitt](https://github.com/liggitt)) [SIG Auth and Testing]

  The great question certainly was, what?  Alice looked all round
her at the flowers and the blades of grass, but she did not see
anything that looked like the right thing to eat or drink under
the circumstances.  There was a large mushroom growing near her,
about the same height as herself; and when she had looked under
it, and on both sides of it, and behind it, it occurred to her