Do I need to refill sealant after puncture? I got my first set of brand new tubeless wheels (Mavic Aksium Elite UST) and next day I had a somewhat large (it looks more than 4 mm) puncture.  The sealant did its job, but my teammates described it as a "beer flowing from my tire".

Now I'm worried that I might need to add more sealant to the tire, but I don't know how much and I don't want to waste whatever fluid remains inside, since it is totally new.  Any recommendations?

Also, is it OK to leave the tire with such a puncture as it is now?
Pull the valve core and poke a 2mm Allen wrench down to test the fluid level with the valve at the 6 o'clock position with the tire off the ground. You want "some" free liquid. How much depends on the tire size but I usually look for at least 3mm. 

Some amount of sealant from a new installation goes to coating the tire and in many cases filling in the porosity of the casing. So if you find there's no free sealant and you're surprised you lost that much, that might be why.

How much free sealant you want is largely based on preference in terms of flat resistance versus weight. It's not a super exact science. 

With the valve core removed you can inject more sealant using a commercial injector or various improvised tools.