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Adds simple breadcrumb comment to client class commentary including the
`google.api.api_version` value that this client was generated based on
and sends in its requests, as per AIP-4236. This breadcrumb will allow
client users to reference the API version used by the client in other
API artifacts e.g. product documentation.

Fixes internal tracking bug http://b/467138606, child of
http://b/467065424.

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Removes old badge references in the README.md template

We will stop using the public GCS buckets (b/468377909), where we
currently store the build badges. The template in sdk-platform-java referenced
the badges in the bucket.

In the monorepo generation test, I had to disable the README comparison
check with google-cloud-java, because google-cloud-java hasn't received
the updates from this change yet.

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#4030)

…ol resizing and refresh

Before this change ChannelPool creates a new
SingleThreadScheduledExecutor every time getTransportChannel is called.
We can reuse the same background executor from the clientSettings and
can reduce the number of threads when the user creates many instances of
the client.

---------

Co-authored-by: Blake Li <blakeli@google.com>

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[com.google.cloud:grpc-gcp](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/tree/master/grpc-gcp)
([source](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java)) |
patch | `1.9.0` -> `1.9.1` |
|
[com.google.errorprone:error_prone_annotations](https://errorprone.info)
([source](https://togithub.com/google/error-prone)) | minor | `2.45.0`
-> `2.46.0` |
|
[com.google.http-client:google-http-client](https://togithub.com/googleapis/google-http-java-client)
| patch | `2.0.2` -> `2.0.3` |
|
[com.google.protobuf:protobuf-java](https://developers.google.com/protocol-buffers/)
([source](https://togithub.com/protocolbuffers/protobuf)) | patch |
`4.33.1` -> `4.33.4` |
|
[commons-codec:commons-codec](https://commons.apache.org/proper/commons-codec/)
([source](https://togithub.com/apache/commons-codec)) | minor | `1.19.0`
-> `1.20.0` |
|
[io.opentelemetry:opentelemetry-bom](https://togithub.com/open-telemetry/opentelemetry-java)
| minor | `1.57.0` -> `1.58.0` |
|
[org.apache.httpcomponents.client5:httpclient5](https://hc.apache.org/)
| minor | `5.5.1` -> `5.6` |
| [org.apache.httpcomponents.core5:httpcore5](https://hc.apache.org/) |
minor | `5.3.6` -> `5.4` |

---

### Release Notes

<details>
<summary>GoogleCloudPlatform/grpc-gcp-java
(com.google.cloud:grpc-gcp)</summary>

###
[`v1.9.1`](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/releases/tag/v1.9.1)

[Compare
Source](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/compare/v1.9.0...v1.9.1)

#### What's Changed

- fix: race for metrics values. Plus fix log metrics when reported via
otel callbacks by [@&#8203;nimf](https://togithub.com/nimf) in
[https://github.com/GoogleCloudPlatform/grpc-gcp-java/pull/228](https://togithub.com/GoogleCloudPlatform/grpc-gcp-java/pull/228)

**Full Changelog**:
GoogleCloudPlatform/grpc-gcp-java@v1.9.0...v1.9.1

</details>

<details>
<summary>google/error-prone
(com.google.errorprone:error_prone_annotations)</summary>

###
[`v2.46.0`](https://togithub.com/google/error-prone/releases/tag/v2.46.0):
Error Prone 2.46.0

[Compare
Source](https://togithub.com/google/error-prone/compare/v2.45.0...v2.46.0)

Changes:

- The javac flag `-XDaddTypeAnnotationsToSymbol=true` is now required
for Error Prone invocations on JDK 21, to enable the javac fix for
[JDK-8225377: type annotations are not visible to javac plugins across
compilation boundaries](https://bugs.openjdk.org/browse/JDK-8225377).
See
[https://github.com/google/error-prone/issues/5426](https://togithub.com/google/error-prone/issues/5426)
for details.
- Remove deprecated `value` attribute from `@IncompatibleModifiers` and
`@RequiredModifiers`
([https://github.com/google/error-prone/issues/2122](https://togithub.com/google/error-prone/issues/2122))
- Error Prone API changes to encapsulate references to internal javac
APIs for end position handling (`EndPosTable`, `DiagnosticPosition`)
(google/error-prone@5440bb4,
google/error-prone@06c2905,
google/error-prone@f3915ec)

New checks:

-
[`DuplicateAssertion`](https://errorprone.info/bugpattern/DuplicateAssertion):
detect duplicated assertion lines where the argument to `assertThat` is
pure
-
[`IfChainToSwitch`](https://errorprone.info/bugpattern/IfChainToSwitch):
suggest converting chains of if-statements into arrow switches
-
[`ScannerUseDelimiter`](https://errorprone.info/bugpattern/ScannerUseDelimiter):
discourage `Scanner.useDelimiter("\\A")`
-
[`AddNullMarkedToClass`](https://errorprone.info/bugpattern/AddNullMarkedToClass):
refactoring to add `@NullMarked` annotation to top level classes

</details>

<details>
<summary>googleapis/google-http-java-client
(com.google.http-client:google-http-client)</summary>

###
[`v2.0.3`](https://togithub.com/googleapis/google-http-java-client/blob/HEAD/CHANGELOG.md#203-2025-12-19)

[Compare
Source](https://togithub.com/googleapis/google-http-java-client/compare/v2.0.2...v2.0.3)

##### Bug Fixes

- **apache5:** Set connection request timeout on setTimeout
([#&#8203;2129](https://togithub.com/googleapis/google-http-java-client/issues/2129))
([d11d794](https://togithub.com/googleapis/google-http-java-client/commit/d11d794d452a662bddd4402cd5d3895bcbe769f3))

</details>

<details>
<summary>apache/commons-codec (commons-codec:commons-codec)</summary>

###
[`v1.20.0`](https://togithub.com/apache/commons-codec/blob/HEAD/RELEASE-NOTES.txt#Apache-Commons-Codec-1200-Release-Notes)

The Apache Commons Codec team is pleased to announce the release of
Apache Commons Codec 1.20.0.

The Apache Commons Codec component contains encoders and decoders for
formats such as Base16, Base32, Base64, digest, and Hexadecimal. In
addition to these
widely used encoders and decoders, the codec package also maintains a
collection of phonetic encoding utilities.

This is a feature and maintenance release. Java 8 or later is required.

</details>



<details>
<summary>open-telemetry/opentelemetry-java
(io.opentelemetry:opentelemetry-bom)</summary>

###
[`v1.58.0`](https://togithub.com/open-telemetry/opentelemetry-java/blob/HEAD/CHANGELOG.md#Version-1580-2026-01-09)

[Compare
Source](https://togithub.com/open-telemetry/opentelemetry-java/compare/v1.57.0...v1.58.0)

##### API

##### Incubator

- Delete GlobalConfigProvider in favor of access via
ExtendedOpenTelemetry

([#&#8203;7914](https://togithub.com/open-telemetry/opentelemetry-java/pull/7914))
-   Add DeclarativeConfigProperties#get method

([#&#8203;7923](https://togithub.com/open-telemetry/opentelemetry-java/pull/7923))
- Update ConfigProvider#getInstrumentationConfig response to be non-null

([#&#8203;7954](https://togithub.com/open-telemetry/opentelemetry-java/pull/7954))
-   Add declarative config utility methods for common operations

([#&#8203;7927](https://togithub.com/open-telemetry/opentelemetry-java/pull/7927))

##### SDK

##### Traces

-   Implement SDK metrics for trace

([#&#8203;7895](https://togithub.com/open-telemetry/opentelemetry-java/pull/7895),

[#&#8203;7930](https://togithub.com/open-telemetry/opentelemetry-java/pull/7930))
-   Emit warning when TraceIdRatioBasedSampler is used as child sampler

([#&#8203;7937](https://togithub.com/open-telemetry/opentelemetry-java/pull/7937))

##### Logs

-   Implement SDK metrics for logs

([#&#8203;7931](https://togithub.com/open-telemetry/opentelemetry-java/pull/7931))

##### Exporters

-   Prom exporter update

([#&#8203;7934](https://togithub.com/open-telemetry/opentelemetry-java/pull/7934))

##### Extensions

-   Declarative config: update to opentelemetry-configuration 1.0.0-rc.3

([#&#8203;7861](https://togithub.com/open-telemetry/opentelemetry-java/pull/7861))
- Declarative config: update jaeger remote sampler to require endpoint,
initial_sampler

([#&#8203;7943](https://togithub.com/open-telemetry/opentelemetry-java/pull/7943))
-   Declarative config: add support for view unit

([#&#8203;7942](https://togithub.com/open-telemetry/opentelemetry-java/pull/7942))
- Declarative config: add support for new logger config minimum_severity
and trace_based properties

([#&#8203;7940](https://togithub.com/open-telemetry/opentelemetry-java/pull/7940))
- Declarative config: add support for composable parent threshold
sampler

([#&#8203;7941](https://togithub.com/open-telemetry/opentelemetry-java/pull/7941))
- Declarative config: improve pattern for validating and loading SDK
extension plugins

([#&#8203;7947](https://togithub.com/open-telemetry/opentelemetry-java/pull/7947))

##### Project tooling

-   Use develocity build cache in PRs and local builds

([#&#8203;7906](https://togithub.com/open-telemetry/opentelemetry-java/pull/7906))
-   Configure japicmp classpath to avoid false positives

([#&#8203;7945](https://togithub.com/open-telemetry/opentelemetry-java/pull/7945))

</details>

---

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