[Feature] Add error_message Search in Spend Logs Endpoint

[yuneng-jiang]

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
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Type

🆕 New Feature
✅ Test

Changes

Adds error_message query parameter to the spend logs endpoint to filter logs by error message using partial string matching.

Screenshots

[vercel]

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Project	Deployment	Review	Updated (UTC)
litellm	Error		Jan 28, 2026 11:19pm