Description
Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
[Problem]
Currently, ADK use OpenTelemetry to send tracing telemetry data to monitoring service.
But the information currently sent is limited and does not follow theOpenTelemetry Semantics.
For example, on Cloud Trace, it is shown that it is a GenAI span, but the number of input/output tokens is not shown.
Also, the current discussion in OpenTelemetry is moving towards sending each message and choice as an event, so we should align with that.
Refs:
https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-spans/
https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-events
Describe the solution you'd like
Support OpenTelemetry GenAI Span Attributes and Events.
Additional context
As a separate discussion, ADK is currently using CloudTraceSpanExporter, but the Cloud Trace API has strict limitations on the amount of data that can be sent, making it unsuitable for use with GenAI. I think it would be better to change this to use the OpenTelemetry Protocol (OTLP), but that's a separate issue.