feat: wrap fetchClient to add HTTP client attributes to remote servic…

[vkozyura]

Adds HTTP semantic convention attributes to remote service spans by wrapping fetchClient.executeHttpRequest.

Alternative considered: Using @opentelemetry/instrumentation-undici response hooks to propagate attributes from HTTP child spans. This approach was rejected as it requires an additional dependency and creates duplicate spans.

[hyperspace-insights]

Summary

The following content is AI-generated and provides a summary of the pull request:

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feat: Add HTTP Semantic Convention Attributes to Remote Service Spans

New Feature

✨ Enriches remote service spans with HTTP semantic convention attributes by wrapping fetchClient.executeHttpRequest. This improves observability for outbound HTTP calls made through CDS remote services, populating standard OpenTelemetry attributes such as request method, response status code, full URL, server address, and port.

Changes

• lib/tracing/remote.js (new): Implements the remote tracing wrapper. Hooks into fetchClient.executeHttpRequest after CDS services are served, sets HTTP semantic convention attributes (http.request.method, url.full, server.address, server.port) before the call, and captures http.response.status_code from both successful responses and error responses. Includes a double-wrapping guard and graceful fallback if the fetchClient module cannot be loaded.

• lib/tracing/index.js: Registers the new remote tracing module by calling require('./remote')() alongside the existing cds and cloud_sdk tracing setups.

• test/tracing-attributes.test.js: Adds a remote test suite that spins up a local HTTP server and verifies that after making a GET request through a CDS remote service, all expected HTTP attributes are recorded on the active span. The test is skipped for CDS v8 due to Cloud SDK module resolution issues in the test environment.

• test/bookshop/package.json: Adds @sap/cds-dk as a devDependency (version ^9) to support the new remote service tests.

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PR Bot Information

Version: 1.20.51

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