* is the only one in use, but if we encounter nested concatenations, we start a deque of
     * meta-iterators rather than letting the nesting get arbitrarily deep.  This keeps each
     * operation O(1).
     */

    private @Nullable Iterator<? extends Iterator<? extends T>> topMetaIterator;

    // Only becomes nonnull if we encounter nested concatenations.

Go <code>const</code> declarations defined in the current package.
Go assembly should avoid making assumptions about the layout of Go
types and instead use these constants.
This improves the readability of assembly code, and keeps it robust to
changes in data layout either in the Go type definitions or in the
layout rules used by the Go compiler.
</p>

<p>
Constants are of the form <code>const_<i>name</i></code>.

### Other notable changes

* Federation: allow specification of dns zone by ID ([#36336](https://github.com/kubernetes/kubernetes/pull/36336), [@justinsb](https://github.com/justinsb))

class _DefaultLifespan:
    """
    Default lifespan context manager that runs on_startup and on_shutdown handlers.

    This is a copy of the Starlette _DefaultLifespan class that was removed
    in Starlette. FastAPI keeps it to maintain backward compatibility with
    on_startup and on_shutdown event handlers.

    Ref: https://github.com/Kludex/starlette/pull/3117
    """

    def __init__(self, router: "APIRouter") -> None:

- If a pod has a running instance, the stats of its previously terminated instances will not show up in the kubelet summary stats any more for CRI runtimes such as containerd and cri-o. This keeps the behavior consistent with Docker integration, and fixes an issue that some container Prometheus metrics don't work when there are summary stats for multiple instances of the same pod. ([#77426](https://github.com/kubernetes/kubernetes/pull/77426),...

### API Change

- #### Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:
  
  <!--
  This section can be blank if this pull request does not require a release note.
  
  When adding links which point to resources within git repositories, like
  KEPs or supporting documentation, please reference a specific commit and avoid

* Fix shebangs in charm actions to use python3 ([#42058](https://github.com/kubernetes/kubernetes/pull/42058), [@Cynerva](https://github.com/Cynerva))
* K8s master charm now properly keeps distributed master files in sync for an HA control plane. ([#41351](https://github.com/kubernetes/kubernetes/pull/41351), [@chuckbutler](https://github.com/chuckbutler))

    * This keeps the behavior consistent with Docker integration, and fixes an issue that some container Prometheus metrics don't work when there are summary stats for multiple instances of the same pod.

    * This keeps the behavior consistent with Docker integration, and fixes an issue that some container Prometheus metrics don't work when there are summary stats for multiple instances of the same pod.

Shinsuke Sugaya <******@****.***> 1523506789 +0900