You can use cloud proxies in vRealize Operations Cloud to collect and monitor data from your on-premises data centers.

Cloud proxies provide high availability within your cloud environment, you can group two or more cloud proxies to form a collector group. The cloud proxy collector group ensures that there is no single point of failure in your cloud environment. If one of the cloud proxies experiences a network interruption or becomes unavailable, the other cloud proxy from the collector group takes charge and ensures that there is no downtime. All other user-initiated manual operations on the collector, such as to stop or restart the collector manually, do not result in automated rebalancing.
Note: When cloud proxies provide high availability within your cloud environment, the cluster can survive the loss of one data node without losing any data. However, the cloud proxy does not gurantee that the adapter instance will collect all the data during adapter instance failover (or when reassigning the adapter instance). vRealize Operations Cloud cloud proxy only provides additional application level data protection to ensure application level availability
You can also use cloud proxies to rebalance the resources across the collectors in your collector group. The Rebalance option is available as part of the Edit menu in the Collector Groups page.
Note: You can use the rebalance option before the vCenter Adapter initiates data collection. Once the data collection starts, the rebalance option is disabled.