Explore the journey of defining effective SLOs for data-intensive services in this 24-minute conference talk from SREcon19 Europe/Middle East/Africa. Delve into the challenges of designing and maintaining a search engine service at Booking.com, focusing on the evolution from ineffective availability and latency SLOs to a more comprehensive monitoring process. Learn how to develop insightful Service Level Objectives that go beyond standard metrics, addressing the importance of accurate and consistent responses in data-intensive environments. Gain valuable insights into scalability, service monitoring, data consistency, traffic management, and automated mitigation strategies for complex search and reservation systems.