public com.google.devtools.cloudtrace.v2.Span.Attributes.Builder getAttributesBuilder() {
      bitField0_ |= 0x00000040;
      onChanged();
      return getAttributesFieldBuilder().getBuilder();
    }
<pre>
A set of attributes on the span. You can have up to 32 attributes per
span.
</pre>

<code>.google.devtools.cloudtrace.v2.Span.Attributes attributes = 7;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java