[#646] JS OTel sample leaves an open connection when shutting down

[ceciliaavila]

Fixes #646

Description

This pull request enhances OpenTelemetry instrumentation for the Node.js sample by improving the SDK shutdown process. It also adds support for Undici HTTP client tracing to have observability over fetch requests.

Detailed Changes

• Improved the SDK shutdown handler to handle multiple signals safely, enforce a shutdown timeout, and ensure the process exits cleanly after shutdown.
• Explicitly enabled the AlwaysOnSampler for tracing to ensure all traces are captured.
• Added @opentelemetry/instrumentation-undici as a dependency and enabled UndiciInstrumentation in the SDK configuration to support tracing for the Undici HTTP client.

Testing

These images show the sample successfully restarted and the traces properly exported.

[Copilot]

Pull request overview

This pull request updates the Node.js OpenTelemetry (OTel) sample to shut down the OTel SDK more reliably (to avoid lingering connections on restart) and expands tracing coverage by adding Undici (fetch) instrumentation.

Changes:

• Adds a guarded shutdown handler with a timeout and explicit process exit after sdk.shutdown().
• Enables AlwaysOnSampler to ensure traces are always sampled.
• Adds @opentelemetry/instrumentation-undici and wires UndiciInstrumentation into the SDK.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
samples/nodejs/otel/src/instrumentation.ts	Updates SDK configuration (sampler + instrumentations) and improves shutdown handling to avoid lingering resources.
samples/nodejs/otel/package.json	Bumps OpenTelemetry dependencies and adds Undici instrumentation dependency.
samples/nodejs/otel/package-lock.json	Updates lockfile to reflect the new/updated OpenTelemetry dependency graph.

Files not reviewed (1)

• samples/nodejs/otel/package-lock.json: Generated file

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