litelm Files

success_callbacks

New observability hook: append to litelm.success_callbacks to receive per-completion telemetry (model, provider, response, latency_ms). Fires for both completion and acompletion on every non-streaming success path (mock, custom-handler, direct-SDK).

Matches litellm's success_callback shape so existing integrations port directly. Exceptions raised by observers are logged and swallowed.

Streaming callbacks are out of scope for this release — usage data only lands in the final chunk.

See [#12] and [#13] for design + rationale.