fix(litellm): trace prompt caching metrics - #704
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Normalize cache reads and cache creation, including TTL-specific breakdowns, to Braintrust metric names without duplicate aggregate writes. Add cassette-backed coverage for cache creation and reuse across supported LiteLLM versions.
Luca Forstner (lforst)
approved these changes
Aug 19, 2026
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resolves https://linear.app/braintrustdata/issue/SDK-188/native-support-for-prompt-caching-metrics-when-using-litellm-gateway
Normalize cache reads and cache creation, including TTL-specific breakdowns, to Braintrust metric names without duplicate aggregate writes. Add cassette-backed coverage for cache creation and reuse across supported LiteLLM versions.