TL;DR: From prompts, tools calls, and traces to evals & cost data, agent telemetry has become the new clickstream, and ClickHouse’s architecture has made it the default observability database for AI companies like Anthropic and OpenAI. Sacra estimates ClickHouse hit $250M ARR in May 2026, up from $160M at the end of 2025. For more, check out our full report and dataset on ClickHouse...