public Builder setEtag(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      etag_ = value;
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Optional. Etag of the subscription.

If present, it must match with the server's etag. Otherwise, request
fails with the status `ABORTED`.
</pre>

<code>string etag = 4 [(.google.api.field_behavior) = OPTIONAL];</code>

@param value The etag to set.
@return This builder for chaining.
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/DeleteSubscriptionRequest.java