fix(core): buffer chat compression telemetry

[mturac]

Summary

• wrap chat compression OTEL log emission and metrics in the telemetry buffer
• update the logChatCompression regression test to prove the buffered callback owns both operations

Fixes #23445

Validation

• npm run test --workspace @google/gemini-cli-core -- src/telemetry/loggers.test.ts -t logChatCompression
• npm run typecheck --workspace @google/gemini-cli-core

[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 improves the telemetry handling for chat compression events by moving log emission and metric recording into the telemetry buffer. This change ensures that these operations are managed consistently with other buffered telemetry events, improving reliability and performance. The associated regression test has been updated to confirm that the buffered callback correctly triggers both the log emission and the metrics recording.

Highlights

• Telemetry Buffering: Wrapped chat compression OpenTelemetry log emission and metrics recording within the telemetry buffer to ensure consistent event handling.
• Regression Testing: Updated the logChatCompression test suite to verify that the buffered callback correctly executes both logging and metric recording operations.

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 the 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 counterproductive. 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. ↩

[github-actions]

📊 PR Size: size/M

• Lines changed: 50
• Additions: +32
• Deletions: -18
• Files changed: 2

[gemini-code-assist]

Code Review

This pull request wraps the OpenTelemetry logging and metrics recording for chat compression events inside a bufferTelemetryEvent callback within logChatCompression. It also updates the corresponding unit tests in loggers.test.ts to mock and verify this buffering behavior. I have no feedback to provide as there are no review comments and the changes are correct.