TLDR Tech / Data
Metric Semantic Layer: How Lyft Governs and Scales Key Data Definitions
Lyft built an internal Metric Semantic Layer to solve metric definition drift and ensure consistent business logic across teams. It enforces governance through “Golden Metrics,” dual ownership (Business + Operational owners), versioned updates, and access via Python APIs, self-service UI, Amundsen catalog, and AI agents, providing a single source of truth that propagates changes automatically.
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