y></table></section><h2 id=Params-Trace>Params.Trace</h2><section><p>Details of Stackdriver Trace configuration for tracespan template.</p><table class=message-fields><thead><tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr></thead><tbody><tr id=Params-Trace-sample_probability><td><code>sampleProbability</code></td><td><code>double</code></td><td><p>Proability that a particular trace ID will be sampled.</p></td><td>No</td></tr></tbody></table></section><h2 id=google-api-MetricDescript