In chainlink keepers document here. There is a conf called checkGasLimit with 6,500,000 as the default value.
Since the computation in checkUpKeep is expected to be outsourced off-chain, why there is a configuration called checkGasLimit where computation is off-chain?
Or checkGasLimit is for the situation where function checkUpKeep is supposed to modify some state.
You got it!
checkUpkeep can be used to change the state of the blockchain. The Chainlink nodes will call the checkUpkeep function when it returns true - and if it costs gas, it will use gas.
The use of the checkGasLimit then, is to make sure they don't use too much gas. Per the docs:
The maximum amount of gas that can be used by your checkUpkeep for off-chain computation.
