Booking.com, a leading online travel platform, underwent a significant transformation in its observability strategy by consolidating multiple observability solutions into a unified platform with Grafana Cloud. This transition, driven by the need for a scalable, cost-efficient, and modernized system, enabled Booking.com to centralize its telemetry data, including metrics, logs, traces, and profiles, using OpenTelemetry and as-code practices to enhance automation and consistency. The move also involved replacing various homegrown and costly solutions with vendor-agnostic pipelines that could support both on-premises and cloud-based services. This shift aimed to improve real user monitoring and profiling capabilities, thereby enhancing application performance and customer satisfaction. Throughout this process, Booking.com emphasized the importance of teamwork, transparent communication, cost analysis, and continuous education to ensure a successful adoption of the new observability strategy.