Hi tayair,
It's possible for most components - anything that uses simple ICMP/TCP heartbeats would work. The DLR forwarding address would be the exception as it's distributed across all of your prepared hosts. Some third party tools have NSX plugins, I believe. On the VMware front, VRNI is probably the most feature complete tool for monitoring. Log Insight is another great tool, as is VROPS.
Hope this helps.
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