SLICK: Adopting SLOs for improved reliability

What this post added

This post introduces SLICK, a dedicated SLO store built to standardize and centralize Service Level Indicator (SLI) and Service Level Objective (SLO) definitions across Meta. SLICK provides tooling for defining SLOs, offers high-retention, full-granularity data (up to two years) for key service metrics, and integrates SLOs into daily workflows and incident management. The architecture includes a DSL for configuration, a syncer, a UI for dashboards and index, a service for query abstraction, and data pipelines for ingestion into a sharded MySQL database. SLICK has seen widespread adoption, with over 1,000 services onboarded, and has demonstrably helped teams like LogDevice and backend ML services identify and fix reliability regressions.