[dynamic control] Register implementers

[jackshirazi]

Description:

Wire up implementers so they get applied by policies.

Existing Issue(s):

#2546

Testing:

Added

Documentation:

Previously included

Outstanding items:

Wiring up the policy pipeline:

• Generic: message -> provider -> policy -> policy handler -> implementer
• eg "change sampling rate" message -> OpampPolicyProvider -> TraceSamplingRatePolicy -> PolicyStore -> TraceSamplingRatePolicyImplementer

Steps needed for the wiring:

• configuring the pipeline
  • DONE: PolicyInitConfig
• providers reading policies, eg OpampPolicyProvider, FilePolicyProvider, etc
  • DONE: OpampPolicyProvider
• implementers applying policies, eg TraceSamplingRatePolicyImplementer
  • DONE: TraceSamplingRatePolicyImplementer
• policy structures (eg TraceSamplingRatePolicy) that the provider converts messages into
  • DONE: TraceSamplingRatePolicy
• registering config to policy structures (eg "trace_sampling_rate_policy" registered to TraceSamplingRatePolicy)
  • DONE: PolicyInit static initialiizer
• initializing policy classes (eg TraceSamplingRatePolicy needs to install a custom sampler)
  • DONE: TraceSamplingRatePolicy initialization
• activate configured providers (eg start OpampPolicyprovider reading from it's source)
  • TBD
• register implementers for policies (eg a new TraceSamplingRatePolicy is applied by a TraceSamplingRatePolicyImplementer)
  • This PR
• link the provider to processing policies and applying implementers
  • DONE PolicyInit

[Copilot]

Pull request overview

Wires dynamic-control policy implementers into the policy pipeline so implementers are registered with PolicyStore and receive relevant policy snapshots/updates.

Changes:

• Register initialized PolicyImplementer instances with PolicyStore during PolicyInit initialization and clear the store on shutdown.
• Extend PolicyStore to support implementer registration and to notify implementers when policies change (filtered by supported policy types).
• Add unit tests verifying implementers receive current and updated relevant policies.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/PolicyStoreTest.java	Adds tests for implementer registration and update notifications.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/registry/PolicyInit.java	Registers implementers with the store and clears store state during shutdown.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/PolicyStore.java	Adds implementer registration, notification logic, and store clearing.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.