* chore: onboard to librarian

* chore: cleanup

Always put `None` into the request queue when closing a bidi stream.

This ensures that the request queue is always signaled as closed, even if the underlying gRPC call object is not yet available.

* Use error log over `print` to avoid stdout write

* Move common return to end of function

* Update google/api_core/_python_version_support.py

Co-authored-by: Chalmer Lowe <chalmerlowe@google.com>

* Fix lint error

---------

Co-authored-by: Chalmer Lowe <chalmerlowe@google.com>

…y38/py39 (#859)

* fix: remove call to importlib.metadata.packages_distributions() for py38/py39

* cover

* update comment

Additional clean up following
#856

---------

Co-authored-by: ohmayr <omairn@google.com>
Co-authored-by: Victor Chudnovsky <vchudnov@google.com>

… performance test setup (#865)

Fix flaky tests due to imprecision in floating point calculation and
performance test setup

This change is needed as part of b/463296248

As per[ this
README](https://github.com/googleapis/repo-automation-bots/blob/main/packages/sync-repo-settings/README.md),
the `sync-repo-settings` bot is deprecated. The bot has already been
disabled for this repo and this configuration is now obsolete.

This change is needed as part of b/463296248. Instead of having 4
different presubmits that run 4 different nox unit tests, we now have
all 4 patterns tested under a single nox session. This follows the
pattern that we have in google-cloud-python where there is a single unit
test nox session.

This PR addresses the feedback from Github in
#873

The Python SDK will use a hybrid approach for mTLS enablement:

If the GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is set
(either true or false or any value), the SDK will respect that setting.
This is necessary for test scenarios and users who need to explicitly
control mTLS behavior.
If the GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable is not
set, the SDK will automatically enable mTLS only if it detects Managed
Workload Identity (MWID) or X.509 Workforce Identity Federation (WIF)
certificate sources. In other cases where the variable is not set, mTLS
will remain disabled.

---------

Signed-off-by: Radhika Agrawal <agrawalradhika@google.com>

Mypy tests are are currently failing, due to a combination of a typing
change in the auth library, and the deprecation of Python 3.7

This PR fixes mypy, and makes the types a bit more explicit

The `pytype` nox session was not running as a presubmit so I've removed
it. `pytype` is deprecated as per [this
note](https://github.com/google/pytype?tab=readme-ov-file#an-update-on-pytype).

PR created by the Librarian CLI to initialize a release. Merging this PR
will auto trigger a release.

Librarian Version: v1.0.1
Language Image:
us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:c8612d3fffb3f6a32353b2d1abd16b61e87811866f7ec9d65b59b02eb452a620
<details><summary>google-api-core: 2.29.0</summary>

##
[2.29.0](v2.28.1...v2.29.0)
(2026-01-08)

### Features

* make parse_version_to_tuple public (#864)
([c969186](c969186f))

* Auto enable mTLS when supported certificates are detected (#869)
([f8bf6f9](f8bf6f96))

### Bug Fixes

* remove call to importlib.metadata.packages_distributions() for
py38/py39 (#859)
([628003e](628003e2))

* Log version check errors (#858)
([6493118](6493118c))

* flaky tests due to imprecision in floating point calculation and
performance test setup (#865)
([9340408](93404080))

* closes tailing streams in bidi classes. (#851)
([c97b3a0](c97b3a00))

</details>