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bceac495f9
Reports whether a node's online/offline transition forces peers to recompute their netmap. True for subnet routers, relay targets (tailscale.com/cap/relay), and via targets; false otherwise. The relay-target IP set and via-target tag set are precompiled from the grants in updateLocked, alongside the existing filter, so the per-node check is a cheap set lookup. Keyed on the node itself, so an ordinary node in a tailnet that uses relay or via for other nodes is still classified as not needing a recompute. Updates #3293