Upgrade to Aria Operations 8.16 and above fails early in the upgrade.
VMware Aria Operations 8.14 will be the last release to provide support for Remote Collectors. In the 8.16 release, upgrades will not be allowed if there are Remote Collectors in use. To upgrade to 8.16 or a later release, it is imperative to replace all Remote Collectors with Cloud Proxies.
If you are using a collector group, you must add new cloud proxies to it and remove the Remote Collectors.
It is recommended that if you are not already using a collector group, create a new collector group and deploy cloud proxies into it. Reassign all adapter instances that were previously associated with Remote Collectors to the collector groups and remove the Remote Collectors.