feat(bigquery): add url.template to span tracing

[ldetmer]

This PR adds url.template to span tracing. It is added at client invocation as its not available in HttpRequest received by HttpTracingRequestInitializer.

Note this PR also adds this and previous PR attribute behind dev gate flag

example trace

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the observability of BigQuery operations by integrating the url.template into the OpenTelemetry tracing spans. This enhancement allows developers to see the specific API endpoint template associated with each BigQuery RPC call, which is crucial for debugging and understanding the flow of requests within a distributed system. The change ensures that this valuable context is available where it's most relevant, at the point of client invocation.

Highlights

• Tracing Enhancement: Added the url.template attribute to OpenTelemetry spans for BigQuery RPC calls, providing more granular detail in distributed traces.
• Implementation Strategy: The url.template is now captured at the client invocation level, as it is not available in the HttpRequest within the HttpTracingRequestInitializer.
• Code Refactoring: Modified HttpBigQueryRpc to pass the uriTemplate to the span creation method and updated BigQueryTelemetryTracer to define the new attribute key, while removing it from HttpTracingRequestInitializer.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request enhances OpenTelemetry tracing for BigQuery RPC calls by including the URI template in the generated spans. The changes involve modifying HttpBigQueryRpc.java to pass the URI template to the createRpcTracingSpan method across various BigQuery operations (Dataset, Table, Routine, Job, TableData, Model, IAM policies). A new URL_TEMPLATE attribute key is defined in BigQueryTelemetryTracer.java, and HttpBigQueryRpcTest.java is updated to verify this attribute. The URL_TEMPLATE attribute key is removed from HttpTracingRequestInitializer.java, consolidating its definition. The review feedback suggests using the BigQueryTelemetryTracer.URL_TEMPLATE constant in the test file for improved maintainability and consistency.