- Added two client certificate metrics for exec auth:
    - `rest_client_certificate_expiration_seconds` a gauge reporting the lifetime of the current client certificate. Reports the time of expiry in seconds since January 1, 1970 UTC.

Prior to 1.17 and for existing nodes created by `kubeadm init` where kubelet client certificate rotation is desired, you must modify `/etc/kubernetes/kubelet.conf` to point to the PEM symlink for rotation:

	handleCommonArgs(ctxt)

	logger.FatalIf(CheckLocalServerAddr(globalMinioAddr), "Unable to validate passed arguments")

	var err error
	var setupType SetupType

	// Check and load TLS certificates.
	globalPublicCerts, globalTLSCerts, globalIsTLS, err = getTLSConfig()
	logger.FatalIf(err, "Unable to load the TLS configuration")

	// Check and load Root CAs.

OkHttp 2.x Change Log
=====================

## Version 2.7.5

_2016-02-25_

 *  Fix: Change the certificate pinner to always build full chains. This
    prevents a potential crash when using certificate pinning with the Google
    Play Services security provider.


## Version 2.7.4

_2016-02-07_

 *  Fix: Don't crash when finding the trust manager if the Play Services (GMS)
    security provider is installed.

If a self-signed certificate is being used, the certificate can be added to MinIO's certificates directory, so it can be trusted by the server.

#### DNS SRV Records

- The CertificateSigningRequest API is promoted to certificates.k8s.io/v1 with the following changes:
  - `spec.signerName` is now required, and requests for `kubernetes.io/legacy-unknown` are not allowed to be created via the `certificates.k8s.io/v1` API
  - `spec.usages` is now required, may not contain duplicate values, and must only contain known usages

  in kube-apisever and kube-controller-manager pods. Instead, it shifted to supporting the
  mounting of /etc/pki/ca-trust and /etc/pki/tls/certs. The locations /etc/ca-certificate,
  /usr/share/ca-certificates, /usr/local/share/ca-certificates, and /etc/ssl/certs continued
  to be supported. ([#124361](https://github.com/kubernetes/kubernetes/pull/124361), [@neolit123](https://github.com/neolit123))

- Kubeadm: during execution of the "check expiration" command, treat the etcd CA as external if there is a missing etcd CA key file (etcd/ca.key) and perform the proper validation on certificates signed by the etcd CA. Additionally, make sure that the CA for all...

        }
    }
    
    private boolean isAuthorizedWitnessServer(InetAddress server) {
        // Implementation would check against authorized server list
        // Could use certificates, Kerberos, etc.
        return true;  // Simplified
    }
    
    private boolean isValidNotificationSource(WitnessNotification notification) {
        // Validate notification signature/source

- When `--rotate-server-certificates` is enabled, kubelet will no longer request a new certificate on startup if the current certificate on disk is satisfactory. ([#69991](https://github.com/kubernetes/kubernetes/pull/69991), [@agunnerson-ibm](https://github.com/agunnerson-ibm))