Where does the strategy measure health metrics from: Yearn (internal calcs), Mellow, or Gearbox?

[steve0xp]

Bot monitoring: It is important to be aware of the health factor of the actual strategy, but are we trusting these metrics based on:

1. Mellow metrics - their system where they use Marginal Factor Balance & State checks?
2. Gearbox metrics - health factors for specific credit accounts?
3. Yearn own metrics - health bots querying blockchain to see value of assets based off of converting assets in open strategy positions & other internal math

Context:

• Mellow uses M*x as the Marginal Factor Balance that is strives to have. Basically M is the marginal factor, x is the total USD for assets in a strategy. Rebalancing occurs to ensure that this is in a healthy state, defined by the strategist I think.
• Gearbox monitoring: view functions available to see total && twv && hf. Yearn could check the hf directly for the mellow-gearbox credit account and gauge if they want to withdraw or not based on this and any other internal aspects (perhaps Yearn has its own way of calculating the hf with it's own twv calculation. --> ex. I'm not sure how the max price drop during liquidation is calculated in gearbox.

function calcTotalValue(address creditAccount)
        external
        view
        returns (uint256 total, uint256 twv);

&&

function calcCreditAccountHealthFactor(address creditAccount)
        external
        view
        returns (uint256 hf);

[steve0xp]

Closing this as we figure this out in issue #14