### Federation
* The --dns-provider argument of 'kubefed init' is now mandatory and does not default to `google-clouddns`. To initialize a Federation control plane with Google Cloud DNS, use the following invocation: 'kubefed init --dns-provider=google-clouddns' ([#42092](https://github.com/kubernetes/kubernetes/pull/42092), [@marun](https://github.com/marun))

   * [RealConnection.noNewExchanges] property. This defends against races where a connection is
   * simultaneously adopted and removed.
   */
  private val connections = ConcurrentLinkedQueue<RealConnection>()

  init {
    // Put a floor on the keep alive duration, otherwise cleanup will spin loop.
    require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
  }

  fun idleConnectionCount(): Int =

        assertEquals("01_refreshed", config3.getId());
    }

    @Test
    public void test_init_cacheConfiguration() {
        // Test that init properly configures the cache
        CrawlingConfigHelper newHelper = new CrawlingConfigHelper();
        newHelper.init();
        assertNotNull(newHelper);
        // Cache should be initialized and functional
        assertNull(newHelper.getCrawlingConfig("invalid"));
    }

 - The default Bootstrap Token created with `kubeadm init` v1.8 expires
 and is deleted after 24 hours by default to limit the exposure of the
 valuable credential. You can create a new Bootstrap Token with
 `kubeadm token create` or make the default token permanently valid by specifying
 `--token-ttl 0` to `kubeadm init`. The default token can later be deleted with
 `kubeadm token delete`.

        preCommands(context);
        container(context);
        postContainer(context);
        pushUserProperties(context); // after PropertyContributor SPI
        lookup(context);
        init(context);
        postCommands(context);
        settings(context);
        return execute(context);
    }

    protected InvokerException.ExitException handleException(C context, Exception e) {

        return@lazy HandshakeCertificates
          .Builder()
          .heldCertificate(heldCertificate)
          .addTrustedCertificate(heldCertificate.certificate)
          .build()
      }

      init {
        val platformSystemProperty = getPlatformSystemProperty()

        if (platformSystemProperty == JDK9_PROPERTY) {
          if (System.getProperty("javax.net.debug") == null) {

     * cached response older than 24 hours, we are required to attach a warning.
     */
    private fun isFreshnessLifetimeHeuristic(): Boolean = cacheResponse!!.cacheControl.maxAgeSeconds == -1 && expires == null

    init {
      if (cacheResponse != null) {
        this.sentRequestMillis = cacheResponse.sentRequestAtMillis
        this.receivedResponseMillis = cacheResponse.receivedResponseAtMillis
        val headers = cacheResponse.headers

	if err != nil {
		return available
	}

	// A valid value is available return its 90%
	available = (memStats.Available * 9) / 10
	return available
}

func (t *apiConfig) init(cfg api.Config, setDriveCounts []int, legacy bool) {
	t.mu.Lock()
	defer t.mu.Unlock()

	clusterDeadline := cfg.ClusterDeadline
	if clusterDeadline == 0 {
		clusterDeadline = 10 * time.Second
	}

- Fixed a bug where init containers may fail to start due to a temporary container runtime failure. ([#127213](https://github.com/kubernetes/kubernetes/pull/127213), [@SergeyKanzhelev](https://github.com/SergeyKanzhelev)) [SIG Node]

	baseTestCases := []TestSuiteCommon{
		// Init and run test on ErasureSD backend with signature v4.
		{serverType: "ErasureSD", signer: signerV4},
		// Init and run test on ErasureSD backend, with tls enabled.
		{serverType: "ErasureSD", signer: signerV4, secure: true},
		// Init and run test on Erasure backend.
		{serverType: "Erasure", signer: signerV4},
		// Init and run test on ErasureSet backend.