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# Description Telemetry extensions resolved meters and activity sources as `Opc.Ua.Types`, with results dependent on helper inlining. This prevented reliable attribution to the emitting component. - **Existing telemetry contract**: Add `CreateMeter(Assembly)` and `GetActivitySource(Assembly)` directly to `ITelemetryContext`. The separate `IAssemblyTelemetryContext` interface has been removed. - **Reliable component attribution**: Capture the caller assembly in non-inlined `CreateMeter`, `GetActivitySource`, and `StartActivity` extensions, then forward it to the existing telemetry context. - **Call-site routing and fallback**: Keep non-null meter calls on `telemetry.CreateMeter()`. Use explicit `TelemetryExtensions.CreateMeter(telemetry)` for nullable-context fallback. Preserve default meter/activity-source fallback when a context returns null. - **Coverage and documentation**: Cover caller-assembly naming, direct-context and extension routing, activity creation, and null-result fallback. Update diagnostics examples, OpenTelemetry filters, and migration guidance. **Compatibility:** Direct implementations of `ITelemetryContext` must implement the two new assembly-aware members. `TelemetryContextBase` supplies both. This interface addition is documented in the 2.0 migration guide; legacy implementer compatibility is not claimed. ## Local validation The Release build and focused `TelemetryExtensionsTests` fixture pass on both target frameworks: | Target | Result | | --- | --- | | net10.0 | Passed: 6, Failed: 0, Skipped: 0 | | net48 | Passed: 6, Failed: 0, Skipped: 0 | Both builds emit existing CA5394 warnings in `NodeStateChildNameIndexTests.cs`, which is unchanged by this PR. The full solution test suite was not run during this feedback pass. ## Related Issues ## Checklist - [ ] I have signed the [CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf) and read the [CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md) doc. - [x] I have added tests that prove my fix is effective or that my feature works and increased code coverage. - [x] I have added all necessary documentation. - [x] I have verified that my changes do not introduce (new) build or analyzer warnings. - [ ] I ran **all** tests locally using the **UA.slnx** solution against at least .net **framework** and .net **10**, and all passed. - [ ] I fixed **all** failing and flaky tests in the CI pipelines and **all** CodeQL warnings. - [x] I have addressed **all** PR feedback received. <!-- START COPILOT CODING AGENT SUFFIX --> - Fixes #4483 --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com> Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>