As organizations scale, so do their challenges. In this session, we'll share our journey migrating terabytes of metrics data from Grafana Mimir to ClickHouse-a transformation driven by the need to overcome scalability and flexibility limitations in our previous stack.

We’ll discuss the initial pain points that prompted the switch, from storage and operational bottlenecks to the constraints of PromQL-based querying. The migration was far from a simple lift-and-shift: we had to ensure uninterrupted service, continue delivering new features, and ingest fresh data throughout the process. Our approach balanced dual operation between platforms, incremental data movement, and robust validation strategies.

A key part of our transformation was rethinking our ingestion paradigm, moving from PromQL to ClickHouse SQL. We’ll detail the technical and organizational hurdles we faced, the solutions that worked, and the lessons learned-offering practical insights for anyone considering a similar migration or looking to modernize their stack. Join us for a deep dive into the real-world challenges and breakthroughs of managing data at scale.