You can collect and visualize etcd metrics using tools like Prometheus, Grafana, and `etcdctl`. The `/metrics` endpoint provides a snapshot of current values for all available metrics. You can secure communication with the `/metrics` endpoint by passing authentication information with your request. Prometheuse allows you to track performance over time, while Grafana provides history, trends, and patterns in the values of metrics stored in Prometheus. Etcd's `etcdctl` command-line tool allows you to execute simple tests and query the status of your etcd nodes. You can use `etcdctl` to gather information about your cluster for troubleshooting and analysis. The `journalctl` command provides a way to view etcd logs, which contain information about the etcd process, activity, and other data that can help with troubleshooting.