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Launch Phoenix

No uv? pip install arize-phoenix && phoenix serve does the same thing. See Terminal setup for customization.
Phoenix serves its UI and OTLP HTTP on port 6006, and OTLP gRPC on port 4317. For a local instance that’s http://localhost:6006 — leave it running while you work.
Dify connects to Phoenix over the network, so it needs the endpoint you just started — and an API key if the instance requires one.
Pointing at a deployment with authentication enabled? Set PHOENIX_COLLECTOR_ENDPOINT to that deployment’s hostname and PHOENIX_API_KEY to an API key from its Settings page. A local phoenix serve needs neither.

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Connect Dify and Phoenix

To configure Phoenix tracing in your Dify application:
  1. Open the Dify application you want to monitor.
  2. In the left sidebar, navigate to Monitoring.
  3. On the Monitoring page, select Phoenix in the Tracing drop down to begin setup.
  4. Enter your Phoenix credentials and save. You can verify the monitoring status on the current page.

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Observe

View Dify traces in Phoenix. Get rich details into tool calls, session data, workflow steps, and more.

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