Pleas add more checks for VMware monitoring.
My propositions are:

• CPU/Memory ratio real (item for ESXi host and VMware Cluster) - real ratio of resource usage, calculated as:
  CPU: 100% * ( cpu.usage / ( number.of.cores * cpu.freq) )
  MEM: 100% * ( memory.usage / total.memory )
• CPU/Memory ratio fake/assigned (item for ESXi host and VMware Cluster) - ratio of resources assigned to VMs, calculated as:
  CPU: 100% (number.of.vCores.assigned / number.of.cores)
  MEM: 100% (sum.of.memory.assigned.to.VMs / total.memory)
  This would be useful for monitoring over commitment of resources.
  Eventually please add only items for monitoring assigned resources (not used), and rest of calculation can be done by zabbix aggregate and calculated items. (But it would by nice to have this ratios auto-of-the-box)

• Datastore IO usage (read and write)
• Datastore space usage