feat(metrics): add comprehensive STT token usage tracking#4542

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Sahilgul wants to merge 13 commits intolivekit:mainfrom

Sahilgul:feature/stt-tracing

Commits on Jan 18, 2026

feat(metrics): add token usage fields to STTMetrics
Sahilgul
committed
feat(metrics): add STT token usage tracking to UsageCollector
Sahilgul
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feat(stt): extract and emit token usage in recognize() method
Sahilgul
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feat(openai): add token usage extraction for STT transcriptions
Sahilgul
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Add token usage fields to STTMetrics
Sahilgul
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Add STT token usage tracking to UsageSummary
Sahilgul
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Add STTTokenUsage TypedDict and token_usage field to SpeechEvent
Sahilgul
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Extract and pass OpenAI transcription token usage to SpeechEvent
Sahilgul
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Fix FakeAudioOutput playback position to use audio duration instead of wall-clock time on interruption
Sahilgul
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Fix FakeAudioOutput to correctly track played audio and handle interruptions
Sahilgul
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Add recognition usage metrics to Azure STT plugin
Sahilgul
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fix(azure): remove redundant call_soon_threadsafe in _emit_recognition_usage
Sahilgul
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fix(tests): remove duplicate on_playback_finished call in clear_buffer
Sahilgul
committed