[BIP-79] Enable COMP/wstETH Gauge [Ethereum]

Summary:

This pool uses the new weighted pool factory which allows us to apply the protocol fee to yield bearing tokens. This gauge would enter as a "core pool" under BIP-19, meaning protocol fees earned by this pool would be used to bribe for votes on it. In addition, any COMP collected by the ProtocolFeeCollector would also be used to bribe for votes on this pool for the next two protocol fee distribution periods after approval.

References/Useful links:

Link to: • Website • Documentation • Github Page
• Communities

Protocol Description:

wstETH is liquid staked ETH. COMP is the governance token for Compound.

Motivation:

Balancer has acquired significant COMP/WETH liquidity and this presents an opportunity to bootstrap a yield bearing version with wstETH which should result in higher protocol revenue, plus allows this liquidity to be self-sustaining via BIP-19 in case the large voter supporting COMP/WETH decides to move on. COMP liquidity is fairly thin on-chain, if Balancer can secure our position as the dominant liquidity source it should prove lucrative over the long run.

Specifications:

1. Governance: Find more information about governance on Lido's forum.

2. Oracles: This pool relies on a rate provider for wstETH which Balancer has been using already for awhile. See here.

3. Audits: See here.

4. Centralization vectors: See here for information on this.

5. Market History: See here.

6. Value: Balancer will earn the protocol fee on wstETH yield. By paring with wstETH we encourage more wstETH trading activity and since wstETH/ETH is one of our largest pools, any increase in trading activity will make wstETH liquidity even more profitable for us. We are already the primary destination for COMP liquidity so moving it over to wstETH should not result in any drop in swap fees.

Link to pool Link to gauge: 0x9C0f4144D037688e0AdA74B22a9aAb7c14c58e6C