Synthetic monitoring offers a user-centric perspective on service health by simulating user interactions and capturing metrics that reflect the end-user experience, rather than solely relying on traditional metrics like CPU and memory usage, which may not accurately represent system functionality. The tutorial by Brian Gann demonstrates using hosted Grafana to set up synthetic monitoring through a Python script that simulates a 10-step login and validation process, capturing metrics like connection latency, response duration, and success state. These metrics are formatted for Graphite but can be adapted for other databases like InfluxDB, providing insights into potential bottlenecks and helping ensure a service remains operational from a user's perspective, even if some components are degraded. The process involves using tools like Chrome Developer tools and Postman to identify each step, and the resulting data is visualized in Grafana dashboards, enabling service reliability engineers to optimize and maintain the health of applications effectively.