Since Goo growth of a given tank grows quadratically per added , it is optimal for the growth of to increase as often as possible. On-chain conditions determine when it is preferable for the pool, or an Externally Owned Account, to mint a new Gobbler from the VRGDA auction rather than buying a Gobbler at the pool's market rate.
Minting modeling can be found here.
The vault currently mints by permissioned endpoint
mintGobblers() which mints when certain curve balancing conditions are met using the current VRGDA price.