public Builder setAnnotation(
          com.google.devtools.cloudtrace.v2.Span.TimeEvent.Annotation.Builder builderForValue) {
        if (annotationBuilder_ == null) {
          value_ = builderForValue.build();
          onChanged();
        } else {
          annotationBuilder_.setMessage(builderForValue.build());
        }
        valueCase_ = 2;
        return this;
      }
<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