Reorganize OpenTelemetry demos, add top-level README

examples/open-telemetry/langfuse/README.md

@@ -0,0 +1,82 @@
+# Langfuse Tracing for Pipecat
+
+This demo showcases [Langfuse](https://langfuse.com) tracing integration for Pipecat services via OpenTelemetry, allowing you to visualize service calls, performance metrics, and dependencies with a focus on LLM observability.
+
+Pipecat trace in Langfuse:
+
+https://github.com/user-attachments/assets/13dd7431-bf5e-42e3-8d6d-2ed84c51195d
+
+## Setup Instructions
+
+### 1. Create a Langfuse Project and get API keys
+
+[Self-host](https://langfuse.com/self-hosting) Langfuse or create a free [Langfuse Cloud](https://cloud.langfuse.com) account.
+Create a new project and get the API keys.
+
+### 2. Environment Configuration
+
+Base64 encode your Langfuse public and secret key:
+
+```bash
+echo -n "pk-lf-1234567890:sk-lf-1234567890" | base64
+```
+
+Create a `.env` file with your API keys to enable tracing:
+
+```
+ENABLE_TRACING=true
+# OTLP endpoint for Langfuse
+OTEL_EXPORTER_OTLP_ENDPOINT=http://cloud.langfuse.com/api/public/otel
+OTEL_EXPORTER_OTLP_HEADERS=Authorization=Basic%20<base64_encoded_api_key>
+# Set to any value to enable console output for debugging
+# OTEL_CONSOLE_EXPORT=true
+
+# Service API keys
+DEEPGRAM_API_KEY=your_key_here
+CARTESIA_API_KEY=your_key_here
+OPENAI_API_KEY=your_key_here
+```
+
+### 3. Install Dependencies
+
+```bash
+pip install -r requirements.txt
+```
+
+### 4. Run the Demo
+
+```bash
+python bot.py
+```
+
+### 5. View Traces in Langfuse
+
+Open your browser to [https://cloud.langfuse.com](https://cloud.langfuse.com) to view traces.
+
+## Langfuse-Specific Configuration
+
+In the `bot.py` file, note the HTTP exporter configuration:
+
+```python
+from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
+
+# Create the exporter - configured from environment variables
+otlp_exporter = OTLPSpanExporter()
+
+# Set up tracing with the exporter
+setup_tracing(
+    service_name="pipecat-demo",
+    exporter=otlp_exporter,
+    console_export=bool(os.getenv("OTEL_CONSOLE_EXPORT")),
+)
+```
+
+## Troubleshooting
+
+- **No Traces in Langfuse**: Ensure that your credentials are correct and follow this [troubleshooting guide](https://langfuse.com/faq/all/missing-traces)
+- **Connection Errors**: Verify network connectivity to Langfuse
+- **Authorization Issues**: Check that your base64 encoding is correct and the API keys are valid
+
+## References
+
+- [Langfuse OpenTelemetry Documentation](https://langfuse.com/docs/opentelemetry/get-started)