feat: flagd provider creates named daemon threads for error executor

[jarebudev]

This PR

Enables the flagd provider to create descriptively named daemon threads, similar to the changes made in open-feature/java-sdk#1633

Related Issues

Resolves #1599

[gemini-code-assist]

Summary of Changes

Hello @jarebudev, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the flagd provider by implementing a custom ThreadFactory to assign descriptive names to the daemon threads used by its internal error executor. This change significantly improves the debuggability and observability of the provider, as these background threads will now be easily identifiable in thread dumps and monitoring tools, aligning with similar improvements made in other parts of the Java SDK.

Highlights

• Custom Thread Factory: A new FlagdThreadFactory has been introduced to enable the creation of descriptively named daemon threads, improving thread identification.
• Error Executor Naming: The FlagdProvider's errorExecutor now utilizes the FlagdThreadFactory to ensure its background threads have meaningful and unique names.
• Test Coverage: Comprehensive unit tests have been added for the FlagdThreadFactory to validate its thread naming and daemon thread behavior.

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[gemini-code-assist]

Code Review

This pull request introduces a FlagdThreadFactory to create named daemon threads for the error executor in the FlagdProvider. This is a good improvement for debuggability, as it makes it easier to identify these threads. The implementation is straightforward and includes relevant unit tests. I have a couple of suggestions to improve maintainability and robustness.

[aepfli]

thank you, this will make debugging easier.

[toddbaert]

@jarebudev 🙏