When I run telegraf --test /etc/telegraf the output for system is:
> system,host=134e7e15f4ba load1=2.21,load15=1.92,load5=2.31,n_cpus=1i,n_users=0i 1667813275000000000
> system,host=134e7e15f4ba uptime=245239i 1667813275000000000
> system,host=134e7e15f4ba uptime_format="2 days, 20:07"...