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What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Bug fix
What is the current behavior? (You can also link to an open issue here)
Arbitrum subgraph is having problem for couple days.. Before we enable V2_SUPPORTED in SOR, v3 subgraph issue would result in 404 no route. Now with v2 support, it will get all the pools metadata as part of getHighestLiquidityUSDPool, so SOR/routing-api will now throw at L254, resulting in 500.
What is the new behavior (if this is a feature change)?
We can explicitly remove arbitrum from V2_SUPPORTED, so that it is equivalent to prior the deploy, and observe 5xx to go down on Arbitrum.
Other information: