[dynamic control] Add policy store

[jackshirazi]

Description:

The policy store will be used as a middle component between ingest and application of policies. The initial implementation is simply to avoid re-applying the latest set of policies that were applied, using a simple comparison. More sophisticated prioritization strategies will be applied when the OTEP has stabilized in that area. Because equality is used, equals is now required to be implemented for policies

Existing Issue(s):

#2546

Testing:

Included in this PR

Documentation:

Included in this PR

Outstanding items:

Hooking up the policy store to the policy pipeline is still to come, I am deliberately keeping PRs small for easier review

[Copilot]

Pull request overview

Adds an initial PolicyStore component to hold the latest validated policy snapshot and avoid re-applying unchanged policies, as part of the dynamic-control “Telemetry Policy” pipeline work.

Changes:

• Introduces PolicyStore with snapshot update + equality-based change detection.
• Adds unit tests covering update/no-op behavior, value changes, ordering changes, and empty default.
• Implements equals/hashCode for TelemetryPolicy (type-only instances) and TraceSamplingRatePolicy.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/PolicyStore.java	New store for policy snapshots with equality-based update detection
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/TelemetryPolicy.java	Defines equality for type-only policies (base class instances)
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingRatePolicy.java	Implements equality/hash for trace sampling policy
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/PolicyStoreTest.java	Adds unit tests for PolicyStore behavior

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.