D is the unique identifier for a trace. All spans from the same
trace share the same Trace ID.</p><p>Required.</p></td><td>No</td></tr><tr id=Template-span_id><td><code>spanId</code></td><td><code>string</code></td><td><p>Span ID is the unique identifier for a span within a trace. It is assigned
when the span is created.</p><p>Optional.</p></td><td>No</td></tr><tr id=Template-parent_span_id><td><code>parentSpanId</code></td><td><code>string</code></td><td><p>Parent Span ID is the unique identifier for a par