SLIs (Service Level Indicators) and SLOs (Service Level Objectives) are industry-standard concepts to measure the long-term reliability of systems. In this presentation, we are going to talk about SLICK, the central SLO tracking platform at Meta. We’ll highlight the challenges with reliability tracking at the company historically, and how SLICK is solving these. Afterwards, we are going to walk through SLICK’s high-level architecture, with a focus on how the major pieces are connected with the user workflows. We’ll also talk about how SLICK has introduced SLOs into the culture at Meta, and how our services have improved their reliability as a result.