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chore: merge release v1.27.4 to main#4990

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Jacksunwei wants to merge 12 commits intomainfrom
release/v1.27.4
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chore: merge release v1.27.4 to main#4990
Jacksunwei wants to merge 12 commits intomainfrom
release/v1.27.4

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Syncs version bump and CHANGELOG from release v1.27.4 to main.

GWeale and others added 12 commits March 11, 2026 23:29
The `can_use_output_schema_with_tools` function now checks if a model is a LiteLlm instance by inspecting its type's Method Resolution Order, rather than directly importing `LiteLlm`

Co-authored-by: George Weale <[email protected]>
PiperOrigin-RevId: 882253446
…creation due to missing version field

Co-authored-by: Achuth Narayan Rajagopal <[email protected]>
PiperOrigin-RevId: 883336463
Closes issue #4805

Co-authored-by: Liang Wu <[email protected]>
PiperOrigin-RevId: 883403628
The Vertex AI session service does not natively support persisting usage_metadata. This change serializes usage_metadata into the custom_metadata field under the key '_usage_metadata' when appending events and deserializes it back when retrieving events. This allows usage information to be round-tripped through the Vertex AI session service.

Co-authored-by: George Weale <[email protected]>
PiperOrigin-RevId: 885121070
Close #4947

Co-authored-by: George Weale <[email protected]>
PiperOrigin-RevId: 888296476
Co-authored-by: Sasha Sobran <[email protected]>
PiperOrigin-RevId: 888850792
…82.6

Versions 1.82.7 and 1.82.8 of LiteLLM were affected by a supply chain attack and are now explicitly excluded from the dependency constraints for both project and dev dependencies.

Co-authored-by: George Weale <[email protected]>
PiperOrigin-RevId: 888818704
@GWeale GWeale added the ready to pull [Status] This PR is ready to be importing back to Google label Mar 24, 2026
copybara-service bot pushed a commit that referenced this pull request Mar 25, 2026
Merge #4990

Syncs version bump and CHANGELOG from release v1.27.4 to main.

COPYBARA_INTEGRATE_REVIEW=#4990 from google:release/v1.27.4 71982f2
PiperOrigin-RevId: 888928449
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adk-bot commented Mar 25, 2026

Thank you @Jacksunwei for your contribution! 🎉

Your changes have been successfully imported and merged via Copybara in commit 2a90fbc.

Closing this PR as the changes are now in the main branch.

@adk-bot adk-bot closed this Mar 25, 2026
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6 participants