You can monitor DynDNS updates with Datadog by setting up a read-only user in your DynDNS portal and adding the credentials to the Datadog integrations page. This allows you to visualize changes across your zones, analyze Queries Per Second (QPS) made by zone or record type, and set custom parameters for alerting. By monitoring these metrics, such as dyn.changes and dyn.qps, you can gain insight into how your DNS is performing and stay ahead of issues before they impact users. The flexibility of dynamic DNS systems can make them difficult to monitor at scale, but tools like Datadog provide a way to do so easily.