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fix(livekit): capture STT usage metrics #818

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Merged
Abhijeet Prasad (AbhiPrasad) merged 1 commit into from
Sep 29, 2026
Merged

fix(livekit): capture STT usage metrics #818

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10 changes: 10 additions & 0 deletions py/src/braintrust/integrations/livekit_agents/test_livekit_agents.py
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Original file line number Diff line number Diff line change
Expand Up @@ -476,6 +476,8 @@ def _assert_eou_spans(logs):


def _assert_stt_spans(logs, speech_text):
from livekit.agents.metrics import STTMetrics

stt_logs = _spans_named(logs, "stt_processing")
_assert_any_span(stt_logs, lambda log: log.get("metrics", {}).get("duration", 0) > 0)
_assert_any_span(stt_logs, lambda log: log.get("output", {}).get("text") == speech_text)
Expand All @@ -488,6 +490,14 @@ def _assert_stt_spans(logs, speech_text):
assert "prompt_tokens" not in stt_log.get("metrics", {}), stt_log
assert "completion_tokens" not in stt_log.get("metrics", {}), stt_log
compact_livekit_metrics = stt_log.get("metadata", {}).get("livekit_metrics", {})
if {"input_audio_tokens", "total_tokens"}.issubset(STTMetrics.model_fields):
_assert_any_span(
stt_logs,
lambda log: all(
log.get("metadata", {}).get("livekit_metrics", {}).get(field, 0) > 0
for field in ("total_tokens", "input_audio_tokens")
),
)
assert "duration" not in compact_livekit_metrics, stt_log
assert "label" not in compact_livekit_metrics, stt_log
assert "metadata" not in compact_livekit_metrics, stt_log
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2 changes: 1 addition & 1 deletion py/src/braintrust/integrations/livekit_agents/tracing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -949,7 +949,7 @@ def _metric_event(metrics_obj: Any, metrics_type: str | None, **metadata: Any) -
"ttft",
),
"tts_metrics": ("audio_duration", "cancelled", "characters_count", "streamed"),
"stt_metrics": ("audio_duration", "streamed"),
"stt_metrics": ("audio_duration", "input_audio_tokens", "streamed", "total_tokens"),
"eou_metrics": (
"end_of_turn_delay",
"end_of_utterance_delay",
Expand Down
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