### ConfigMap
* Volumes and environment variables populated from ConfigMap and Secret objects can now tolerate the named source object or specific keys being missing, by adding `optional: true` to the volume or environment variable source specifications. ([#39981](https://github.com/kubernetes/kubernetes/pull/39981), [@fraenkel](https://github.com/fraenkel))

- Kubeadm now warns (instead of error out) on missing "ca.key" files for root CA, front-proxy CA and etcd CA, during "kubeadm join --control-plane" if the user has provided all certificates, keys and kubeconfig files which require signing with the given CA keys. ([#94988](https://github.com/kubernetes/kubernetes/pull/94988), [@neolit123](https://github.com/neolit123))

    assertThrows(
        NullPointerException.class,
        () -> Maps.uniqueIndex((List<String>) listWithNull, Functions.constant(1)));
  }

  /** Null keys aren't allowed either. */
  public void testUniqueIndexNullKey() {
    List<String> oneStringList = Lists.newArrayList("foo");
    assertThrows(
        NullPointerException.class,

rgin","scrollDiv","scrollbarWidth","width","clientWidth","removeChild","_this11","uriAttrs","SAFE_URL_PATTERN","DATA_URL_PATTERN","sanitizeHtml","unsafeHtml","whiteList","sanitizeFn","createdDocument","DOMParser","parseFromString","whitelistKeys","keys","el","elName","nodeName","attributeList","attributes","whitelistedAttributes","concat","allowedAttributeList","attrName","nodeValue","regExp","attrRegex","allowedAttribute","innerHTML","BSCLS_PREFIX_REGEX","DISALLOWED_ATTRIBUTES","HOVER_STATE_SHO...

     */
    String getSessionTrackingModes();

    /**
     * Get the value for the key 'cookie.search.parameter.keys'. <br>
     * The value is, e.g. q,num,sort <br>
     * comment: Comma-separated list of request parameter keys to store in cookies before SSO login.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */

breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))\n//    md\n//    >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl))\n//    md\n@function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {\n  $n: index($breakpoint-names, $name);\n  @return if($n != null and $n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);\n}\n\n// Minimum breakpoint width. Null for the smallest (first) breakpoint.\n//\n//    >>...

      * In 1.4, either that key or this key: `pods.beta.kubernetes.io/init-containers`,can be used.
    * When you GET an object, you will see both annotation keys with the same values.
      You can safely roll back from 1.4 to 1.3, and things with init-containers
      will still work (pods, deployments, etc).

        the environment variable `TF_DETERMINISTIC_OPS` to `"true"` or `"1"`.
*   `tf.print`:
    *   Bug fix in `tf.print()` with `OrderedDict` where if an `OrderedDict`
        didn't have the keys sorted, the keys and values were not being printed
        in accordance with their correct mapping.
*   `tf.train.Checkpoint`:
    *   Now accepts a `root` argument in the initialization, which generates a

        return extension;
    }

    protected Object getExclusionKey(Exclusion exclusion) {
        return exclusion;
    }

    /**
     * Use to compute keys for data structures
     * @param <T>
     */
    private interface KeyComputer<T> {
        Object key(T t);
    }

    /**
     * Remapping function
     * @param <T>
     */

loadDuration","loginRegisterAutoHeight","Layout","fixLayoutHeight","extra","controlSidebar","sidebar","max","_max","$contentSelector","fixLoginRegisterHeight","$selector","SELECTOR_LOGIN_BOX","boxHeight","parseInt","$preloader","numbers","Object","keys","forEach","key","EVENT_KEY","SELECTOR_TOGGLE_BUTTON","SELECTOR_BODY","CLASS_NAME_OPEN","CLASS_NAME_IS_OPENING","CLASS_NAME_CLOSED","autoCollapseSize","enableRemember","noTransitionAfterReload","PushMenu","$bodySelector","autoCollapse","remember",...