@java.lang.Override
      public com.google.devtools.cloudtrace.v2.Span.Attributes build() {
        com.google.devtools.cloudtrace.v2.Span.Attributes result = buildPartial();
        if (!result.isInitialized()) {
          throw newUninitializedMessageException(result);
        }
        return result;
      }
<pre>
A set of attributes as key-value pairs.
</pre>

Protobuf type {@code google.devtools.cloudtrace.v2.Span.Attributes}
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java