Trace Integrity Audit

Check whether a set of spans forms coherent traces. Reports a parent that is not in the data, so the trace renders as fragments rather than one tree; a trace with no root or several; a cyclic parent chain, which makes any walk loop; a span that ends before it starts; and a child whose times fall outside its parent, which is clock skew between hosts rather than a code defect and which every latency figure derived from the trace inherits.