This is the first part of our 12-day Advent of Monitoring series.` is not relevant to the text's main topic, synthetic monitoring. `Hey there! Here is my take on what synthetic monitoring means and why it’s awesome!` sets a friendly tone for the explanation that follows. Synthetic monitoring promotes e2e tests, which simulate real user behavior, by continuously running them against production services. This provides an early warning system, helping developers identify issues before users report problems. It answers questions about feature functionality, auth provider outages, and regional blocking, giving clear signals compared to noisy error logs or metrics dashboards. By leveraging synthetic monitoring with a modern tool like Checkly, developers can keep their apps top-notch and user-friendly.