The issue might be related to the configuration of the `COLLECTOR_ENDPOINT` environment variable. In your `docker-compose.yml`, the `COLLECTOR_ENDPOINT` is set to `<http://phoenix:6006/v1/traces>`, which is incorrect because it includes angle brackets. It should be set without angle brackets, like this:
```
- COLLECTOR_ENDPOINT=http://phoenix:6006/v1/traces
```
Additionally, ensure that your application is correctly configured to send traces to this endpoint. If you are using OpenTelemetry, make sure the `OTLPSpanExporter` is set up with the correct endpoint. Here's an example of how you might configure it in Python:
```
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import SimpleSpanProcessor
span_exporter = OTLPSpanExporter(endpoint="http://localhost:6006/v1/traces")
tracer_provider = TracerProvider()
tracer_provider.add_span_processor(SimpleSpanProcessor(span_exporter))
```
Ensure that your application is running in an environment where it can resolve the `phoenix` service name to the correct IP address. If you continue to experience issues, check the logs of both the Phoenix container and your application for any error messages that might provide more insight.
Would you like more detailed troubleshooting steps?
Sources:
- <https://arize-ai.slack.com/archives/C04R3GXC8HK/p1723828797.781399|https://arize-ai.slack.com/archives/C04R3GXC8HK/p1723828797.781399>
- <https://github.com/Arize-ai/phoenix/issues/5433|https://github.com/Arize-ai/phoenix/issues/5433>