realm

The realm is a string that uniquely identifies an editor and how they edited the data. Realms can be used to differentiate edits made through a feature service as opposed to those made directly to the data in the geodatabase. If a realm string is present, it is appended to the username using the "@" character. For example, a realm string of "denver" is appended to the user "John" to give a user name of "John@denver". For more information, see https://enterprise.arcgis.com/en/server/latest/publish-services/windows/use-realms-with-editor-tracking-fs.htm#ESRI_SECTION1_C48E63619BB149DEB40EE31C6158F6C3.