* fixes invalid null selector issue in sysdig example yaml ([#31393](https://github.com/kubernetes/kubernetes/pull/31393), [@baldwinSPC](https://github.com/baldwinSPC))
* Rescheduler which ensures that critical pods are always scheduled enabled by default in GCE. ([#31974](https://github.com/kubernetes/kubernetes/pull/31974), [@piosz](https://github.com/piosz))

            log.error("Failed to create handle state directory: " + stateDirectory, e);
        }

        // Load persisted handles on startup
        loadPersistedHandles();

        // Schedule periodic persistence and cleanup
        scheduler.scheduleAtFixedRate(this::periodicMaintenance, 30, 30, TimeUnit.SECONDS);
    }

    /**
     * Request a new durable handle
     * @param path the file path
     * @param type the handle type

PersistentVolumeClaim.
  * Run multiple schedulers in parallel, e.g. one or more custom schedulers
alongside the default Kubernetes scheduler, using pod annotations to select
among the schedulers for each pod. Documentation is [here](http://kubernetes.io/docs/admin/multiple-schedulers.md), design doc is [here](docs/proposals/multiple-schedulers.md).
  * More expressive node affinity syntax, and support for “soft” node affinity.

* Default scheduler code is moved out of the plugin directory. ([#57852](https://github.com/kubernetes/kubernetes/pull/57852), [@misterikkit](https://github.com/misterikkit))
    * plugin/pkg/scheduler -> pkg/scheduler
    * plugin/cmd/kube-scheduler -> cmd/kube-scheduler

    /**
     * Shutdown the directory lease manager
     */
    public void shutdown() {
        scheduler.shutdown();
        try {
            if (!scheduler.awaitTermination(5, TimeUnit.SECONDS)) {
                scheduler.shutdownNow();
            }
        } catch (InterruptedException e) {
            scheduler.shutdownNow();
            Thread.currentThread().interrupt();
        }

- Fixed a scheduler panic due to internal cache inconsistency ([#71063](https://github.com/kubernetes/kubernetes/pull/71063), [@Huang-Wei](https://github.com/Huang-Wei))
- Report kube-scheduler unhealthy if leader election is deadlocked. ([#71085](https://github.com/kubernetes/kubernetes/pull/71085), [@bsalamat](https://github.com/bsalamat))

        this.channelCounter = new AtomicInteger(0);
        this.multiChannelEnabled = false;

        // Schedule periodic health checks
        scheduler.scheduleAtFixedRate(this::performHealthCheck, 10, 10, TimeUnit.SECONDS);

        // Schedule interface discovery
        scheduler.scheduleAtFixedRate(this::discoverInterfaces, 0, 30, TimeUnit.SECONDS);
    }

    /**
     * Initialize multi-channel support

- Migrate `pkg/scheduler/framework/plugins/interpodaffinity/filtering.go`,`pkg/scheduler/framework/plugins/podtopologyspread/filtering.go`, `pkg/scheduler/framework/plugins/volumezone/volume_zone.go` to structured logging (#105931, @mengjiao-liu) [SIG Instrumentation and Scheduling]

        this.channelCounter = new AtomicInteger(0);
        this.multiChannelEnabled = false;
        
        // Schedule periodic health checks
        scheduler.scheduleAtFixedRate(this::performHealthCheck, 10, 10, TimeUnit.SECONDS);
        
        // Schedule interface discovery
        scheduler.scheduleAtFixedRate(this::discoverInterfaces, 0, 30, TimeUnit.SECONDS);
    }
    

- kube-apiserver
  - The `--enable-logs-handler` flag and log-serving functionality is deprecated, and scheduled to be removed in v1.19. ([#77611](https://github.com/kubernetes/kubernetes/pull/77611), [@rohitsardesai83](https://github.com/rohitsardesai83))

- kube-proxy