public Builder mergeFrom(com.google.devtools.cloudtrace.v2.Span.Attributes other) {
        if (other == com.google.devtools.cloudtrace.v2.Span.Attributes.getDefaultInstance())
          return this;
        internalGetMutableAttributeMap().mergeFrom(other.internalGetAttributeMap());
        bitField0_ |= 0x00000001;
        if (other.getDroppedAttributesCount() != 0) {
          setDroppedAttributesCount(other.getDroppedAttributesCount());
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<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