Alert "High memory workload caused by Guest Memory Needed metric not being collected" is triggered due to Memory|Workload% metrics in Aria operations is higher than the guest OS Memory usage in VM.
Aria Operations 8.16.x
Aria operations stops collecting Virtual Machine guest stats through VMware tools. Memory|Utilization metric falls back to using Memory|Consumed rather than guest needed memory.
Follow the steps to start recollecting the VM guest stats through VMware tools: