A DNS monitor that only checks whether a record resolves can still miss the issues users actually feel. Slow nameserver responses, propagation lag, and unexpected record changes all create real customer-facing problems even when the simplest check remains green.
Healthy DNS monitoring has to look at more than success or failure. Teams need to understand how records behave over time and across locations, especially when changes are being rolled out or providers are under strain.
Five signals worth watching: record value drift, propagation lag after a change, unexpected TTL shifts, regional nameserver latency spikes, and certificate or expiry mismatches tied to DNS-level configuration.
Bundling these checks together gives teams a system-level view of DNS health rather than a single binary pass or fail.