Routing for Lightning network: was Flare implemented?
As far as I know flare was never implemented for lightning nodes and is not being used. I think current implementations use sind pathfinding algorithms like BfS or  Dijkstra. The pathfinding itself is not part of the BOLTs anyway. A node could do whatever it wants with the information provided from the gossip store / gossip protocol. (BOLT 07). People could in particular decide to go for the approach given by flare.