For cumulative token count always being zero, this usually means token count attributes are missing from your LLM spans. Phoenix requires that spans include `llm.token_count.prompt`, `llm.token_count.completion`, and `llm.token_count.total` attributes for token tracking鈥攖hese are auto-captured with supported auto-instrumentation (e.g., OpenAI, Anthropic), but must be set manually if you instrument your code yourself or use a provider that doesn't return token counts natively. See <https://arize.com/docs/phoenix/tracing/how-to-tracing/cost-tracking#basic-token-counts|Cost Tracking docs> and <https://github.com/Arize-ai/phoenix/blob/main/docs/section-learn/tracing/faqs-tracing.md#for-openai-how-do-i-get-token-counts-when-streaming|FAQs>.
For "unknown" spans, these typically appear when Phoenix receives spans without a recognized `span_kind` or when the instrumentation does not set the expected attributes. This can happen if you have generic spans, incomplete instrumentation, or if the tracing library is capturing more than just LLM-related calls. Review your instrumentation setup to ensure only the intended methods are traced and that all required attributes are set. See <https://arize.com/docs/phoenix/learn/tracing/how-tracing-works|How Tracing Works> for details.
Would you like more detail or troubleshooting steps?
Sources:
- <https://arize.com/docs/phoenix/tracing/how-to-tracing/cost-tracking#basic-token-counts|Cost Tracking docs>
- <https://github.com/Arize-ai/phoenix/blob/main/docs/section-learn/tracing/faqs-tracing.md|FAQs: Tracing>
- <https://arize.com/docs/phoenix/learn/tracing/how-tracing-works|How Tracing Works>
