The CoreDNS plugin exposes metrics in the OpenMetrics format, which can be collected and visualized using tools like Prometheus and Grafana. By default, the `/metrics` endpoint provides a quick look at the current state of your CoreDNS servers, but to explore trends and detect anomalies, it's recommended to collect and store metrics with a Prometheus server and visualize them in Grafana. Additionally, logs provide additional visibility for troubleshooting and root cause analysis, and can be collected using plugins like `log` and `errors`. To view and analyze logs, Kubernetes native logging architecture or a logging agent can be used, and tools like Datadog offer comprehensive visibility into cluster performance.