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deb94c071c
The shared ntfy push tier runs an independent instance per node with NO cross-node shared state, so a publish and a long-lived subscriber that round-robin DNS sends to different instances never meet (measured live: 5/5 same-node, 0/5 cross-node). The gateway fan-out compensates for the gateway publish path, but any direct publisher (and resilience under churn) still loses ~(N-1)/N. Pin push.<baseDomain> to a SINGLE healthy nameserver via a specific A-record (overrides the round-robin wildcard — exact match wins in DNS), maintained by the existing DNS heartbeat: each nameserver deterministically picks the lowest-IP active nameserver (no leader election needed) and prunes stale push records, so it fails over when that node stops heartbeating. Every publisher AND subscriber now converges on one instance => coherent, with no duplicates (the fan-out still reaches that node). Contained to the DNS layer — no changes to the :443/Caddy/ntfy data path. Unit-tested: lowest-IP pick, failover+prune, no-healthy-ns safety, idempotency.