PRTG creates one sensor per VM that you choose in the Add Sensor dialog. Otherwise a simple migration (like vMotion) of the VM between ESXi hosts would cause a false down alarm for the VM. If your VMware environment consists of multiple servers where VMs are not bound to specific ESXi server, make sure you place this sensor on the Virtual Center, instead of the ESXi server. It covers metrics like CPU, memory, disk and network usage within a single sensor per VM. The VMware Virtual Machine (SOAP) sensor monitors the VM using VMWare SOAP protocol. Let’s start with monitoring the VMs from the outside, using VMware’s view on the VMs. VMs can be monitored from outside, so from the VMware ESXi layer, or from inside, so from within the running guest operating system. Let’s leave the hardware and ESXi layer and head on to the next level, the virtual machines or in short VMs.
