opentelemetry changedmanage-claude/opentelemetry
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261261`gen_ai.usage.input_tokens` already includes the tokens read from and written to the prompt cache, so don’t add the cache attributes to it. For all usage attributes, see [Token usage](https://platform.claude.com/docs/en/api/opentelemetry/spans#token-usage).
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263263<Note>
264 Exported spans aren’t guaranteed to be a complete record of your API usage. Their delivery is [best effort](https://platform.claude.com/docs/en/manage-claude/opentelemetry/api#delivery-and-health), so a span can be lost. A caller can also leave out a request’s spans by turning off the sampled flag in the request’s [`traceparent` header](https://platform.claude.com/docs/en/manage-claude/opentelemetry/api#connect-api-spans-to-your-own-traces). To track each API key’s usage, for example to spot a leaked key, use the [Usage API](https://platform.claude.com/docs/en/manage-claude/usage-cost-api#usage-api), which also counts the usage of requests without spans.
264 Exported spans aren’t guaranteed to be a complete record of your API usage. Their delivery is [best effort](https://platform.claude.com/docs/en/manage-claude/opentelemetry/api#delivery-and-health), so a span can be lost. A caller can also leave out a request’s spans by turning off the sampled flag in the request’s [`traceparent` header](https://platform.claude.com/docs/en/manage-claude/opentelemetry/api#connect-api-spans-to-your-own-traces). To track each API key’s usage, for example to spot a leaked key, use the [Usage and Cost Analytics API](https://platform.claude.com/docs/en/manage-claude/usage-cost-analytics-api) and group by `api_key_id`. It also counts the usage of requests without spans. Usage typically appears there within 4 hours (see [Data freshness](https://platform.claude.com/docs/en/manage-claude/usage-cost-analytics-api#data-freshness)).
265265</Note>
266266
267267## Availability
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