public Builder clearValue() {
      valueCase_ = 0;
      value_ = null;
      onChanged();
      return this;
    }
<pre>
The allowed types for `[VALUE]` in a `[KEY]:[VALUE]` attribute.
</pre>

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