[fulmicoton]

This is correct yes. Rumor-mongering is more efficient both in term of detecting/propagating a node failure and in term of network overhead.

We stopped using SWIM because it is too hard to get right, and because scuttlebutt allows all nodes to expose a bunch of meta-information about themselves.

It took a lot of time and effort to Hashicorp to patch memberlist into what it is today.