Every node renews its lease once a minute instead of every 30 minutes,
so the lease works as a heartbeat. x:ClusterNode reports a node Stale
once it has gone three minutes without renewing (it used to take an
hour), and Inactive after a day, as before.
Taking over a lease still needs a full hour of silence. A node that is
slow rather than gone never loses its id to another host, so snowflake
ids stay unique.
The admin dashboard's Cluster Health card counts these statuses.
jcoffey-dev