Rate limit period is not shown in dashboard

Hi,

the traefik v1 parameter "period" for the ratelimit middleware has been added to traefik 2 a few months ago, however it does not show up in the dashboard. Maybe dashboard should show the rate as a float value [1/s], including the possibility of rates < 1? Currently only "average" and "burst" are shown, which does not define the rate when period != 1s. Or, alternatively, include "period" in seconds in the display.

Kind regards, great software!