How to show how many session on vyos 1.3

I config nat rule on vyos, use dperf (a DPDK network performance tools) to test performance.
I want to see how many session on the vyos when I test.

Is voys have show like juniper show security flow sessions

These operational commands will show you the active destination/source NAT translations:

vyos@vyos:~$ show nat destination translations
Possible completions:
  <Enter>       Execute the current command
  address       Show active NAT destination translations for an IP address
  detail        Show active destination NAT translations detail

For source nat rule, use “show nat source translations” , and there are other commands as well: show nat destination/source statistics

I keep the session is 50k (dperf show), use the show nat destination translations, cpu use will be 99%

it have any other low power commands to get approximate data ?

Maybe sudo conntrack -C will help?