Using attributes for chat history on gen_ai spans and events#2179
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lmolkova merged 5 commits intoopen-telemetry:mainfrom Aug 19, 2025
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Using attributes for chat history on gen_ai spans and events#2179lmolkova merged 5 commits intoopen-telemetry:mainfrom
lmolkova merged 5 commits intoopen-telemetry:mainfrom
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Thanks for putting this together! What's need to take this out of draft?
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Unfortunately had to skip today's meeting because of a conflict. Wanted to bring up some cases for sending the prompts and messages as events:
All of this is specifically important for non-purposely built solution, but for a bigger observability platforms. @lmolkova My proposal would be to keep the events optional, and keep them in the existing implementations enabled with an environment variable. |
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Here is a rough prototype of this PR for opentelemetry-instrumentation-google-genai open-telemetry/opentelemetry-python-contrib@main...aabmass:opentelemetry-python-contrib:google-genai-message_ref
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One complication was that in [email protected] 'interface ChatCompletionMessageToolCall' was changed to be: export type ChatCompletionMessageToolCall = | ChatCompletionMessageFunctionToolCall | ChatCompletionMessageCustomToolCall; which complicated capturing 'tool_calls' info for the telemetry event. Note also that the GenAI semconv has since moved on. As of open-telemetry/semantic-conventions#2179 there is no longer a 'tool_calls' property in a captured event. This PR does *not* get into updating the semconv version used by this instrumentation. Unrelated, there was also a fix to a typo in the 'compile:with-dependencies' npm script for this package.
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Fixes #2010, #2179, #1913, #1621, #1912
Depends on #2588
Key points:
gen_ai.system.instructionsattribute. It's not necessarily a part of chat history (when dealing with server-side agents)gen_ai.input.messagesattribute, format is defined in json schema (for now until we have tooling to define complex attributes). If uploading to an external storage, it's replaced withgen_ai.input.messages_refgen_ai.output.messages(orgen_ai.output.messages_ref)gen_ai.client.inference.operation.detailswhich captures all the details of the inference operation so that it can be useful if span is sampled out and/or if queries between spans and logs backends is problematic.Depends on #2046 (
gen_ai.systemrename and migration plan)