Constant NETMAP_CACHE_DIR 

pub const NETMAP_CACHE_DIR: &str = "netmap-cache";

Subdirectory of Server::dir the cold-start netmap cache lives in (Go caches a profile’s netmap under a netmap-cache directory of its own). Held apart from the identity state file so dropping the cache — which control can ask for at any time — cannot reach the node’s keys.