fix(models): update 429 docs link for Gemini

[ftnext]

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Link to Issue or Description of Change

2. Or, if no issue exists, describe the change:

Problem:
src/google/adk/models/google_llm.py includes a mitigation link for 429 RESOURCE_EXHAUSTED, but the current URL points to a broken docs anchor:
https://google.github.io/adk-docs/agents/models/#error-code-429-resource_exhausted

Solution:
Update the link to the current Gemini-specific docs page so users are directed to the correct troubleshooting section:
https://google.github.io/adk-docs/agents/models/google-gemini/#error-code-429-resource_exhausted

Testing Plan

This is a small string-only fix for a broken documentation link.
No unit tests were added because there does not appear to be existing test coverage for this message and the change does not affect runtime behavior beyond the emitted URL.

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Please include a summary of passed pytest results.

Manual End-to-End (E2E) Tests:

Confirmed the updated URL in the source points to the intended documentation page/anchor.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

Additional context

This change only updates the documentation URL shown in the RESOURCE_EXHAUSTED guidance message.

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[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 resolves an issue where a documentation link within the google_llm.py file was broken. The change updates the URL to correctly point to the Gemini-specific mitigation guidance for the 429 RESOURCE_EXHAUSTED error, thereby improving the user experience and troubleshooting process for developers.

Highlights

• Broken Documentation Link: The existing documentation link for the 429 RESOURCE_EXHAUSTED error mitigation in src/google/adk/models/google_llm.py was pointing to a broken anchor, leading users to an incorrect page.
• Updated Link for Gemini: The documentation link has been updated to correctly direct users to the Gemini-specific troubleshooting section for the 429 RESOURCE_EXHAUSTED error, ensuring accurate guidance.

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Changelog

• src/google/adk/models/google_llm.py
  • Updated the URL for _RESOURCE_EXHAUSTED_POSSIBLE_FIX_MESSAGE to point to the correct Gemini documentation.

Activity

• The author performed a self-review of the code changes.
• The author confirmed reading the contribution guide.
• The author manually tested the updated URL to ensure it points to the intended documentation page and anchor.

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[adk-bot]

Response from ADK Triaging Agent

Hello @ftnext, thank you for creating this PR!

In order to get this PR merged, you'll need to sign a Contributor License Agreement (CLA). You can find more information at https://cla.developers.google.com/.

Thanks!

[gemini-code-assist]

Code Review

This pull request correctly updates a broken documentation link in an error message for 429 RESOURCE_EXHAUSTED errors. I've added a minor suggestion to improve the formatting of the multiline string to make the resulting error message more compact and readable.

[gemini-code-assist]

While you're updating the link, you could also improve the formatting of this multiline string to avoid excessive newlines in the final error message. The current definition adds a leading and trailing newline to the string. When combined with the \n\n in the f-string where it's used, this results in extra blank lines in the error output. Removing them will make the error message more compact.

_RESOURCE_EXHAUSTED_POSSIBLE_FIX_MESSAGE = """On how to mitigate this issue, please refer to:

https://google.github.io/adk-docs/agents/models/google-gemini/#error-code-429-resource_exhausted"""

[rohityan]

Hi @ftnext , Thank you for your contribution! We appreciate you taking the time to submit this pull request. Your PR has been received by the team and is currently under review. We will provide feedback as soon as we have an update to share.

[rohityan]

Hi @wuliang229 , can you please review this. LGTM