@omer.gunduz it looks like these are for the Server Not Reporting feature of the legacy alerting system. The way this feature works can lead to some confusion and this is a big part of why we built Infrastructure and the new Alerts system. We also just announced some important news for these features that I would encourage you to have a look over.
Infrastructure also supports the Host no Reporting feature so, while we’ve rebuilt the infrastructure monitoring and Alerts tools from the ground up, we’ve got the functionality you’re used to and so very much more.
I actually wrote a post about Server Not Reporting awhile back to try and explain a little bit of why the feature was inherently temperamental. It’s a bit of a long read but then the topic bears explanation, in my opinion.
Please have a look over both of these posts and if you’ve got further questions don’t hesitate to reply here. I know that there might be questions around this transition, or the necessity for it, and we’re here to help.