To monitor and alert on Nginx ingress in a Kubernetes environment, users can install Prometheus and Grafana to collect metrics and visualize data. The kube-prometheus-stack Helm chart can be used to set up Grafana, Prometheus, and other monitoring components. Next, users need to install and configure Ingress Nginx, which involves installing the ingress-nginx controller and enabling metrics that can be scraped by Prometheus. Users can then create an ingress for a sample application and port-forward the ingress service to send traffic from their local terminal. To configure Grafana dashboards for Ingress Nginx monitoring, users need to import a dashboard, generate sample loads using Vegeta, and set up alerts for common SLIs such as 4xx error rate, 5xx error rate, high latency, and high request rate. Additionally, users can use alert templates in Grafana to make alert messages meaningful. The setup also involves integrating with Slack to receive alerts, which requires creating an incoming webhook from Slack. Overall, this setup helps developers monitor and alert on Nginx ingress in their Kubernetes environment, ensuring the stability and performance of their applications.