Grafana OnCall is a tool introduced with Grafana 8.0, designed to enhance on-call management by integrating with Grafana Cloud to streamline alerting workflows. It centralizes alerting information, allowing users to configure on-call schedules and escalation policies, and customize notifications based on personal preferences. The tutorial demonstrates setting up team member details, importing schedules from Google Calendar, and adjusting notification methods to ensure timely and accurate delivery of alerts. To explore the tool further, users can join a free webinar or try a 14-day trial of Grafana Cloud Pro, which offers comprehensive observability features.