When you configure monitoring in the domain, the Data Integration Services that manage deployed mass ingestion specifications store statistics and reports in a Model repository. The statistics include historical information about the deployed specifications.
If you do not configure monitoring, you cannot monitor the ingestion status in the Mass Ingestion tool. In the Administrator tool, some views on the Manage and Monitor tabs do not have content and you cannot monitor the ingestion mapping jobs. The workflow graph is empty, and notifications disappear when you refresh the page.