otelslog: Ability to set TraceID and SpanID on logs

[jm96441n]

Problem Statement

Most (if not all) APM providers have the ability to connect logs with traces via a traceID and spanID on the log. The otelslog bridge (and by extension the others) should have the ability to set the top level (as defined in log contexts here) TraceID and SpanID. The sdk/log package supports this which makes working with the bridges particularly frustrating as you need to write a complex transformer for an otel collector in order to set these fields.

Proposed Solution

Have the convertRecord function be able to extract an attribute of trace_id and span_id and have them be set on the Record struct so that the top level attributes can be set.

Alternatives

Not doing this and continuing to have to write convoluted transformers for logs.

Prior Art

The sdk/log package handles this use case.

Additional Context

Add any other context or screenshots about the feature request here.

[dmathieu]

While I agree with you that setting the span and trace IDs from attributes makes sense, I can't find trace_id or span_id as semantic conventions.
We'd need that before we can accept that kind of behavior.

[jm96441n]

along those lines is there an expected way to set the TraceID and SpanID fields for the otel log format? I've been trying to get it working via a transformer in the collector yaml, but it's tricky to get it right