handle_traces | Error extracting request body (v94)

[jkanzler]

Hello,

We occasionally see the following error in our logs:

DD_EXTENSION | ERROR | TRACE_AGENT | handle_traces | Error extracting request body: Failed to buffer the request body: error reading a body from connection

A similar issue was reported in #1000 (for handle_proxy), which got addressed with #1046.

The explanation from #1000 (comment) makes sense to us, so looking at the source code we see a similar pattern for handle_traces, which might have the same root cause:

datadog-lambda-extension/bottlecap/src/traces/trace_agent.rs

Lines 479 to 482 in ec644b4

	let (parts, body) = match extract_request_body(request).await {
	Ok(r) => r,
	Err(e) => {
	return error_response(

If it helps, we are currently using v94, though the above error_response is the same for v97 and the runtime is al2023 (for Go).

[tazorax]

Same here, with v96 and al2023 runtime

[lym953]

Similar to #1000, the log message here is not actionable. It's probably because the execution environment is frozen, causing timeout for TCP connections between tracer and extension. I'm going to change the log level from ERROR to DEBUG to make it less noisy.
If you see other issues such as missing traces, let us know and we will treat it as a separate issue.