Watches an SfuCluster and fires a callback when a node is lost unexpectedly.
Remarks
Subscribes to each node's failure/recovery signals and to cluster add/remove
events, invoking onGone exactly once when a node fails or is removed without
first draining. A node that leaves gracefully (isDraining) does not trigger
the callback, and de-duplication prevents repeated fires for the same node.
Used to trigger room migration off dead nodes.
Watches an SfuCluster and fires a callback when a node is lost unexpectedly.
Remarks
Subscribes to each node's failure/recovery signals and to cluster add/remove events, invoking
onGoneexactly once when a node fails or is removed without first draining. A node that leaves gracefully (isDraining) does not trigger the callback, and de-duplication prevents repeated fires for the same node. Used to trigger room migration off dead nodes.