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• Keepalived is left to decide who will be master and who will be backup. We do not interfere with this process but instead simply report it to the management server. This daemon has undergone many years of development to avoid split brains etc.  We do not see a role for cloudstack to try and reinvent this wheel.
• VRRP traffic goes over the lowest configured guest interface.  This means, that a VPC router is not redundant until it has at least one guest network configured!
• Adding a new guest network can cause a master/backup election and can cause disruption to the network traffic for some seconds.
• Script based provisioning, think Terraform etc. goes very fast and Keepalived takes some time to settle down. You may see a situation in which when many provisioning commands are sent one after the other affecting guest networks that it takes 20-30 seconds to settle down.