finalized block doesn't update when rolling up to an L2

[arshsingh]

We're deploying an op-stack chain as an L3 rolling up to Base, but the l2_finalized block only updates when op-node is restarted.

The value of finalityLookback is currently hard-coded to 4*32 + 1, which If my understanding is correct doesn't work well when rolling up to an L2, because a finalization event there can take 4*32*6 blocks, or longer depending on the L2's configuration.

Deploying with v1.7.4, I keep seeing the following error in the logs:

received L1 finality signal, but missing data for immediate L2 finalization

I deployed op-node with an increased value for finalityLookback and I don't see this issue anymore. Blocks are finalizing and the error message disappeared from the logs.

Would it be possible to make finalityLookback configurable?