Here is a 1-paragraph summary of the text: Grafana's alerting functionality allows users to configure visualizations and alerts for key metrics in the same place, making it a powerful tool for monitoring setups. The demo covers four parts: Alerting Principles, Alerts in Grafana, Let's Code: 3 Alerts and 3 Notification channels, and Alerts with NO DATA, covering topics such as universal best practices for alerting, how to define alerts using FOR and without FOR, and how to connect Grafana to popular notification channels like Slack, PagerDuty, and OpsGenie. The demo also provides resources and tutorials to help users recreate the sample monitoring setup and modify it to use their data sources and notification channels.