}
      return oldValue;
    }

    /**
     * Refreshes the value associated with {@code key}, unless another thread is already doing so.
     * Returns the newly refreshed value associated with {@code key} if it was refreshed inline, or
     * {@code null} if another thread is performing the refresh or if an error occurs during
     * refresh.
     */
    @CanIgnoreReturnValue

        }
    }

    /**
     * Attempts to refresh tokens silently using the MSAL4J silent authentication flow.
     * @param user The Entra ID user whose tokens need to be refreshed.
     * @return The new authentication result, or null if silent refresh failed.
     */
    public IAuthenticationResult refreshTokenSilently(final EntraIdCredential.EntraIdUser user) {

  - By default, injected tokens are given an extended lifetime so they remain valid even after a new refreshed token is provided. The metric `serviceaccount_stale_tokens_total` can be used to monitor for workloads that are depending on the extended lifetime and are continuing to use tokens even after a refreshed token is provided to the container. If that metric indicates no existing workloads are depending on extended lifetimes, injected token lifetime can be...

            @Override
            public void onResponse(final RefreshResponse response) {
                if (logger.isDebugEnabled()) {
                    logger.debug(() -> "Refreshed " + stream(indices).get(stream -> stream.collect(Collectors.joining(", "))));
                }
            }

            @Override
            public void onFailure(final Exception e) {

* With this PR, kubectl and other RestClient's using the AuthProvider framework can make OIDC authenticated requests, and, if there is a refresh token present, the tokens will be refreshed as needed. ([#25270](https://github.com/kubernetes/kubernetes/pull/25270), [@bobbyrullo](https://github.com/bobbyrullo))

* Update cluster-proportional-autoscaler, etcd-empty-dir-cleanup, fluentd-gcp, and kube-addon-manager addons with refreshed base images containing fixes for CVE-2015-8271, CVE-2016-7543, CVE-2016-9841, CVE-2016-9843, CVE-2017-1000366, CVE-2017-2616, and CVE-2017-7507. ([#48011](https://github.com/kubernetes/kubernetes/pull/48011), [@ixdy](https://github.com/ixdy))

* Support secure etcd cluster for centos provider. ([#42994](https://github.com/kubernetes/kubernetes/pull/42994), [@Shawyeok](https://github.com/Shawyeok))

* Update to kube-addon-manager:v6.4-beta.2: kubectl v1.6.4 and refreshed base images ([#47389](https://github.com/kubernetes/kubernetes/pull/47389), [@ixdy](https://github.com/ixdy))

* Update to kube-addon-manager:v6.4-beta.2: kubectl v1.6.4 and refreshed base images ([#47389](https://github.com/kubernetes/kubernetes/pull/47389), [@ixdy](https://github.com/ixdy))

* Update cluster-proportional-autoscaler, fluentd-gcp, and kube-addon-manager, and kube-dns addons with refreshed base images containing fixes for CVE-2016-9841, CVE-2016-9843, CVE-2017-2616, and CVE-2017-6512. ([#47454](https://github.com/kubernetes/kubernetes/pull/47454), [@ixdy](https://github.com/ixdy))

### SIG Windows development tools