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feat: add node info metrics - #43
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…ctor (lambdaclass#43) The chain actor re-ran, on its single thread, the column checks that gossip validation had already run in p2p: a KZG batch, a BLS verification and a `process_slots` per sidecar. After an empty slot, that `process_slots` merkleizes the full mainnet state once per sidecar (~1.5 s each, 8 custody columns). On the eth-4 follower on 2026-09-23 this held block 15280808 in the actor's mailbox for 7.6 s, and then for another 4.7 s of "columns_wait" that was really the actor checking columns that had already arrived. The checks now live only in `beacon::gossip::column`. A sidecar gossip did not accept (`Queue`, `Ignore(Overloaded)`), every sidecar fetched by root or by range, and parked sidecars replayed after their parent imports all go through the new `chain_checks`, run by `p2p::beacon::column_checks` on blocking threads. The chain actor stores what reaches it without checking it; debug builds re-run `chain_checks` there, so a p2p path that forwards an unchecked sidecar fails a test. `chain_checks` reads the expected proposer from the parent state's proposer lookahead, and only advances a state clone for a slot outside it. The column rejection and KZG metrics move with the checks.
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