Migrate from TimGroup's java-statsd-client to Datadog's java-dogstatsd-client

[duanemay]

TimGroup java-statsd-client (Current):

Last update: February 19, 2015 (version 3.1.0)
Status: Effectively unmaintained for over 10 years
Update frequency: None - project is dormant

Datadog java-dogstatsd-client (Target):

Latest version: 4.4.5 (August 21, 2025)
Status: Actively maintained and is now the canonical library
Update frequency: Regular releases (typically 3-4 per year) with bug fixes, performance improvements, and new features

Note: This library merged efforts from multiple upstream projects including TimGroup's original library

Key Benefits of Migration

Active maintenance: Regular security patches and bug fixes
Performance improvements: Modern non-blocking implementation with better buffering
Enhanced features: Support for tags, sampling, client-side aggregation, telemetry
Better error handling: Improved error handling and monitoring capabilities
Future compatibility: Continued support and development
Backward Compatibility Assessment
The migration should be very low-risk because:

Note: UAA uses only basic StatsD operations (gauge, count, time)
The Datadog library maintains API compatibility with TimGroup's interface

[Copilot]

Pull request overview

This PR migrates the StatsD client dependency from TimGroup’s unmaintained java-statsd-client to Datadog’s actively maintained java-dogstatsd-client, updating wiring and tests to match the newer client construction pattern while preserving the existing StatsDClient API usage.

Changes:

• Switched the Gradle version-catalog dependency from com.timgroup:java-statsd-client to com.datadoghq:java-dogstatsd-client and bumped the version to 4.4.5.
• Updated StatsdConfiguration to build the client via NonBlockingStatsDClientBuilder instead of the old constructor.
• Simplified the unit test to mock StatsDClient directly (removing reliance on ConvenienceMethodProvidingStatsDClient).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
statsd-lib/src/test/java/org/cloudfoundry/identity/statsd/UaaMetricsEmitterTest.java	Updates mocks to target StatsDClient directly for compatibility with the new dependency.
statsd-lib/src/main/java/org/cloudfoundry/identity/statsd/StatsdConfiguration.java	Updates StatsD client bean creation to the builder-based API.
gradle/libs.versions.toml	Switches module coordinates to Datadog’s client and updates the version to 4.4.5.