Hi team! 👋 I'm using LiveKit Agents (v1.3.5) with Langfuse via OpenTelemetry integration, and I noticed that STT-related spans are not appearing in my traces. I can see these spans being recorded correctly: -

llm_node

,

llm_request

,

llm_request_run

✅ -

tts_node

,

tts_request

,

tts_request_run

✅ -

agent_turn

,

function_tool

, etc. ✅ But there's no

stt_node

or

stt_request

span. I checked the SDK source and found that

llm.py

and

tts.py

have

tracer.start_as_current_span()

calls, but

stt.py

doesn't seem to have any tracing code. My questions: 1. Is this expected behavior? Or am I missing some configuration to enable STT tracing? 2. If intentional, what's the reasoning? Is STT considered less important for observability? 3. Is there a workaround to get STT latency/duration in OpenTelemetry traces? Thanks in advance! 🙏

Hi, this is intentional, for reasoning, please see the response in this issue: https://github.com/livekit/agents/issues/4246