Feat: Gho steward v2

[JoaquinBattilana]

Usage

Allows approved risk provider to change GHO and GSM parameters.

Steps from governance to work as intended

These roles must be assigned by DAO:

• PoolAdmin in the Aave V3 Ethereum Pool
• BucketManager in GHO Token
• Configurator in every GSM asset that the DAO wants the risk council to manage

Owner of the contract (DAO) needs to add each facilitator (GHO AToken/GSM) to a controlled list in GhoStewardV2, with setControlledFacilitator method
FixedRateStrategyFactory must be deployed before deploying the Stewards contract, as its used for creating fixed rate strategies for updating the GHO borrow rate.

Limitations on calls and/or parameters:

General:

• Methods that change facilitators, GSM or GHO parameters can only be called by approved risk provider
• Those methods have a timelock of 2 days

Facilitators:

• updateFacilitatorBucketCapacity:
  • The update changes up to 100% upwards
  • Facilitator must be in controlled list

GHO:

• updateGhoBorrowCap:
  • the update changes up to 100% upwards
• updateGhoBorrowRate:
  • the update changes up to 5.0% upwards or downwards
  • GhoInterestRateStrategy will be used, created by FixedRateStrategyFactory
  • Max value is 25.0%

GSM:

• updateGsmExposureCap:
  • The update changes up to 100% upwards
• updateGsmFeeStrategy:
  • the update changes up to 0.5% upwards (in both buy and sell individually)
  • Asumes that strategy is FixedFeeStrategy, since there is no other way to limit the parameters.
  • Uses FixedFeeStrategy

Management:

• controlFacilitator:
  • Only callable by owner

Considerations:

• There is no expiration set for the contract, so DAO should remove roles in case that they want to deprecate the functionality or call setControlledFacilitator with false if they want to disable it for certain GSMs

[height]

This pull request has been linked to 1 task:

• T-19001 Update GhoStewards with more capabilities (unlink task)

💡Tip: Add "Close T-19001" to the pull request title or description, to a commit message, or in a comment to mark this task as "Done" when the pull request is merged.

[JoaquinBattilana]

Link T-19001

[miguelmtzinf]

Thanks for the review @sakulstra . All changes are applied now.

[marczeller]

as the market conditions changed quite a lot governance is requesting a change in stewards params : https://governance.aave.com/t/arfc-gho-stewards-borrow-rate-update/16956

here's the detail:

Description	Current	Proposed
GHO Borrow Cap	50M	100M
Max GHO Borrow Rate Adjustment	0.50%	5.00%
Max GHO Borrow Rate	9.50%	25.00%
Minimum Frequency of Change	7-Days	2-Days

we suggest implementing these changes and then sync enforcement with vote result

[marczeller]

Suggested change

	uint256 public constant GHO_BORROW_RATE_MAX = 0.0950e27; // 9.50%
	uint256 public constant GHO_BORROW_RATE_MAX = 0.2500e27; // 25.00%

[marczeller]

Suggested change

	uint256 public constant GHO_BORROW_RATE_CHANGE_MAX = 0.0050e27; // 0.50%
	uint256 public constant GHO_BORROW_RATE_CHANGE_MAX = 0.0500e27; // 5.0%

[marczeller]

Suggested change

	uint256 public constant MINIMUM_DELAY = 7 days;
	uint256 public constant MINIMUM_DELAY = 2 days;

[miguelmtzinf]

as the market conditions changed quite a lot governance is requesting a change in stewards params : https://governance.aave.com/t/arfc-gho-stewards-borrow-rate-update/16956

here's the detail:

Description Current Proposed
GHO Borrow Cap 50M 100M
Max GHO Borrow Rate Adjustment 0.50% 5.00%
Max GHO Borrow Rate 9.50% 25.00%
Minimum Frequency of Change 7-Days 2-Days
we suggest implementing these changes and then sync enforcement with vote result

Changes applied per gov thread discussion