Using the standard VMware sensors in PRTG, you can integrate information from your VMware setup into your overall IT-monitoring. But, PRTG has no out-of-the-box feature to count the number of active virtual machines running on your servers. So, I wrote a script that works as an EXE/Script sensor in PRTG and that counts your active VMs.
As PRTG automatically stores all data in the original scanning interval, this sensor will also give you a nice overview about long time trends in your VMware environment. You can find the script and a step-by-step guide for the setup at our Knowledge Base:
If you haven't yet installed PRTG but would like to know more about your IT in general, and especially about your active VMs, I recommend taking a look at our trial. You can download it here, and even after the 30 days trial period expires, you can continue using it with the full feature set and up to 100 sensors. https://www.paessler.com/download/prtg-download
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Paessler AG’s award winning PRTG Network Monitor is a powerful, affordable and easy-to-use Unified Monitoring solution. It is a highly flexible and generic software for monitoring IT infrastructure, already in use at enterprises and organizations of all sizes and industries. Over 200,000 IT administrators in more than 170 countries rely on PRTG and gain peace of mind, confidence and convenience. Founded in 1997 and based in Nuremberg, Germany, Paessler AG remains a privately held company that is recognized as both a member of the Cisco Solution Partner Program and a VMware Technology Alliance Partner.