Generally, we make our recommendations on supply caps following our Supply Cap methodology, which can be found here.
As we are currently in the process of integrating Metis into our system to utilize the above methodology, we are now using a more basic approach. The liquidity screenshots presented above demonstrate the quantity of ETH and Metis that can be exchanged with a price impact close to the liquidation bonus threshold. This represents the maximum amount of tokens that could be liquidated profitably. Considering that these figures are currently quite low, we advise against increasing the caps until liquidity improves, and we utilize our methodology to generate more precise and granular recommendations.