A master-side network blip flips every node in one heartbeat tick, and
each node published its own node.down, then node.up. A notifier queue holds
64 events and the rate limiter keys on the node name, so with 150 nodes most
alerts were dropped and the rest ran into Telegram and Discord limits.
Past five same-direction transitions in one tick the heartbeat publishes a
single event per direction naming the nodes (the first ten, sorted, then
+N). Smaller ticks keep per-node events with their health data, and the
notifiers already read the node name from Source, so no formatter changed.
Sanaei
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