Produced by TraceTree.flatten. level is the depth from the
root span (root = 0) and is used to indent the span label and bar.
serviceName is denormalized from the parent ResourceSpans so that
each row can be coloured/labelled without re-walking the tree.
A single span paired with its rendering metadata.
Produced by TraceTree.flatten.
levelis the depth from the root span (root = 0) and is used to indent the span label and bar.serviceNameis denormalized from the parentResourceSpansso that each row can be coloured/labelled without re-walking the tree.