Opentelemetry Tracer: missing log events

[DanTulovsky]

Title: Opentelemetry Tracer: missing log events

Description: The lightstep tracer used to log span logs (events) as part of its operation. It included information like timing for when the client connected, timing when the first header was received, and, importantly, timing when the last data was received. It was super useful to have this breakdown for troubleshooting, because it would allow finding out if the client is slow sending data.

The opentelementry trace doesn't seem to have this information. Can you please consider adding it?

Thank you

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Any extra documentation required to understand the issue.

[phlax]

cc @alexanderellis @htuch

[github-actions[bot]]

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