CreateChildSpan takes a message part, extracts an existing span if there is one and returns child span.

CreateChildSpans takes a message, extracts spans per message part and returns a slice of child spans.

FinishSpans calls Finish on all message parts containing a span.

GetSpan returns a span attached to a message part.

InitSpans sets up OpenTracing spans on each message part if one does not already exist.

InitSpansFromParent sets up OpenTracing spans as children of a parent span on each message part if one does not already exist.

IterateWithChildSpans iterates all the parts of a message and, for each part, creates a new span from an existing span attached to the part and calls a func with that span before finishing the child span.

WithChildSpans takes a message, extracts spans per message part, creates new child spans, and returns a new message with those spans embedded.

WithSiblingSpans takes a message, extracts spans per message part, creates new sibling spans, and returns a new message with those spans embedded.