It is needed to find bottlenecks in the engine and optimize customer queries. For example, it gives things like: https://github.com/ClickHouse/ClickHouse/pull/108757

You can read more about this approach in my presentation: https://presentations.clickhouse.com/2026-openhouse-sf/great... and video: https://www.youtube.com/watch?v=FmS7VopaqNg