I have noticed that Managed alerts section is not displaying any alerts - on both web servers ?
I see active alerts and information and in the action manager but nothing in Managed alerts ?
Thoughts
I met situations when this was caused by removal of some used custom property, so just go through the audit logs ifrom recent period (since you observe it) if somebody didn't do that and if so, try to recreate it. If this is not the way, create the support ticket. It can be caused by many things, so there will be needed diagnostics to check what's up.
SolarWinds solutions are rooted in our deep connection to our user base in the THWACK® online community. More than 195,000 members are here to solve problems, share technology and best practices, and directly contribute to our product development process.