[dynamic control] enable autoconfigurable extension

[jackshirazi]

Description:

Initial Telemetry policy implementation is done with one policy supported (sampling rate changes), this enables the extension to be autoconfigurable

Existing Issue(s):

#2416

Testing:

Manually tested as working end-to-end with changes

Documentation:

To be added

Outstanding items:

1. Documentation on how to use the extension with autoconfiguration
2. Enabling the extension to be used with declarative config instead of autoconfiguration (needs a ComponentProvider and a DeclarativeCustomizerProvider, PR is blocked on [dynamic control] Register implementers #2858)
3. Documentation on how to use the extension with declarative config
4. Further policies added
5. Further sources implemented (File and HTTP)
6. Align to spec (current implementation has drifted in some areas)
7. Implement TODOs
8. Declarative config telemetry policy node semconv
9. Telemetry policy names semconv

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds dynamic policy initialization during OpenTelemetry auto-configuration and strengthens the corresponding unit test to validate customization behavior.

Changes:

• Invoke PolicyInit.init(...) from DynamicControlAutoConfiguration.customize(...).
• Update DynamicControlAutoConfigurationTest to verify a properties customizer is registered.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/DynamicControlAutoConfiguration.java	Initializes dynamic policy registry during agent auto-configuration.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/DynamicControlAutoConfigurationTest.java	Replaces “no-throw” comment with a Mockito verification of expected customization behavior.