We confirmed that the free ESXi version does not allow SNMP gets, only traps. The original script was taken from here: http://communities.vmware.com/docs/DOC-7170 Modified script: http://mirakulo.com/pub/esxi/check_esx_wbmem.py We added Fan and power supply, hinted from this page: http://www.stephenjc.com/2009/01/whatsup-vmware-esxi-monitor-these.html Use this guide to add the Data source: http://www.zenoss.com/community/docs/howtos/create-modify-nagios-templates Added as template under: /Devices /Server /VMWare /ESXi /Templates /esxi-monitor /check_esx_wbmem Name: check_esx_wbmem Source Type: Command Enable true Use SSH false Component: blank Event class: /VMWare/ESXi Severity: Error Cycle time: 60 Parser: auto Command template: /usr/local/zenoss/python/bin/python /opt/zenoss/libexec/check_esx_wbmem.py https://${dev/manageIp}:5989 root passwd To bind this template to ESXi nodes, go to the device: Example: /Devices /Server /VMWare /ESXi /esxi-01.prod.corp.org then to its temp...