ent span of this span
instance. If this is a root span, then this field MUST be empty.</p><p>Optional.</p></td><td>No</td></tr><tr id=Template-span_name><td><code>spanName</code></td><td><code>string</code></td><td><p>Span name is a description of the span&rsquo;s operation.</p><p>For example, the name can be a qualified method name or a file name
and a line number where the operation is called. A best practice is to use
the same display name within an application and at the same call point.
This makes it e