public java.lang.String getEtag() {
      java.lang.Object ref = etag_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        etag_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Optional. This checksum is computed by the server based on the value of
other fields, and might be sent on update requests to ensure the client has
an up-to-date value before proceeding.
</pre>

<code>string etag = 17 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The etag.
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/Subscription.java