Scope, precisely. This counts only attempts that reached a ledger row.
Router-level declines — no_candidate_pools, under_water,
over_lock_budget, size_collapsed, implausible_edge and the
rest — are tallied in the engine’s in-process counter and printed to its log; they are
never written to the ledger, so they cannot appear here and this page will not
pretend otherwise. To separate “no edge at this latency” from “the lock budget is
wrong” you need the engine’s own decisions line, not this histogram.