public com.google.devtools.cloudtrace.v2.Span.TimeEvent.Annotation.Builder
          getAnnotationBuilder() {
        return getAnnotationFieldBuilder().getBuilder();
      }
<pre>
Text annotation with a set of attributes.
</pre>

<code>.google.devtools.cloudtrace.v2.Span.TimeEvent.Annotation annotation = 2;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java