impl(o11y): introduce resend_count logic

[diegomarquezp]

Introduces gcp.grpc.resend_count and http.request.resend_count.

Although ApiTracer offers attemptStarted(int attemptNumber), here we use an internal counter in order to not depend on external logic that would produce such an argument.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the observability of client-side operations by introducing a resend_count attribute to tracing spans. This attribute, applied to both gRPC and HTTP requests, provides crucial context for understanding and analyzing retry behavior, which is vital for debugging transient errors and optimizing performance in distributed systems.

Highlights

• New Observability Attributes: Introduced new constants, "HTTP_RESEND_COUNT_ATTRIBUTE" and "GRPC_RESEND_COUNT_ATTRIBUTE", to ObservabilityAttributes for tracking the number of times a request has been resent due to retries.
• SpanTracer Enhancement: Modified SpanTracer to track and include a resendCount attribute in attempt spans for retried requests, differentiating between HTTP and gRPC transports.
• Attribute Type Handling: Updated ObservabilityUtils to correctly handle Long type attributes when converting them to OpenTelemetry attributes.
• Comprehensive Testing: Added new unit tests in SpanTracerTest and integration tests in ITOtelTracing to validate the correct propagation and value of the resend_count attribute for both gRPC and HTTP retries.

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[gemini-code-assist]

Code Review

This pull request introduces logic to add a resend_count attribute to observability spans for retried requests. The implementation in SpanTracer is solid, correctly incrementing the count for each retry and adding the appropriate transport-specific attribute. The unit tests for this logic are also well-written.

However, I've found issues in the new integration tests in ITOtelTracing.java. The verification logic for the resend_count attribute is flawed in both the gRPC and HTTP JSON test cases. I've provided suggestions to correct the test logic to ensure it properly validates the new feature.

[sonarqubecloud]

Quality Gate failed for 'gapic-generator-java-root'

Failed conditions
60.7% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
82.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud