action required

- Expand scheduler priority functions and scheduling framework plugins' node score range to [0, 100]. Note: this change is internal and does not affect extender and RequestedToCapacityRatio custom priority, which are still expected to provide a [0, 10] range. ([#83522](https://github.com/kubernetes/kubernetes/pull/83522), [@draveness](https://github.com/draveness))...

        urlFilter.addInclude("^$");
        urlFilter.addExclude(".*");

        // Should handle boundary conditions gracefully
        assertNotNull(urlFilter);
    }

    /**
     * Test pattern priority (include vs exclude)
     */
    public void test_patternPriority() {
        String sessionId = "test-session-025";
        urlFilter.init(sessionId);

        // Add conflicting patterns

import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

/**
 * An [RFC 6265](http://tools.ietf.org/html/rfc6265) Cookie.
 *
 * This class doesn't support additional attributes on cookies, like
 * [Chromium's Priority=HIGH extension][chromium_extension].
 *
 * [chromium_extension]: https://code.google.com/p/chromium/issues/detail?id=232693
 */
@Suppress("NAME_SHADOWING")
class Cookie private constructor(

    /**
     * Flag indicating the message is signed.
     */
    public static final int SMB2_FLAGS_SIGNED = 0x00000008;
    /**
     * Mask for message priority bits.
     */
    public static final int SMB2_FLAGS_PRIORITY_MASK = 0x00000070;
    /**
     * Flag indicating the operation is a DFS operation.
     */

#### Scheduling

* [alpha] This version now supports pod priority and creation of PriorityClasses ([user doc](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/))([design doc](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/scheduling/pod-priority-api.md))

        final Crawler testCrawler = container.getComponent("crawler");

        testCrawler.setThreadPriority(Thread.MAX_PRIORITY);
        // Cannot directly verify thread priority, but ensure no exception
    }

    public void test_setters() throws Exception {
        final Crawler testCrawler = container.getComponent("crawler");

        testCrawler.setNumOfThread(5);

Pod Priority and Preemption in Kubernetes ([#564](https://github.com/kubernetes/enhancements/issues/564))

- Pod priority and preemption enables Kubernetes scheduler to schedule more important Pods first and when cluster is out of resources, it removes less important pods to create room for more important ones. The importance is specified by priority.

### API Priority and Fairness graduates to Beta

Initially introduced in 1.18, Kubernetes 1.20 now enables API Priority and Fairness (APF) by default. This allows `kube-apiserver` to [categorize incoming requests by priority levels](https://docs.k8s.io/concepts/cluster-administration/flow-control/).

### IPv4/IPv6 run

    * Default value for expendable pod priority cutoff in GCP deployment of Cluster Autoscaler changed from 0 to -10.
    * action required: users deploying workloads with priority lower than 0 may want to use priority lower than -10 to avoid triggering scale-up.