Today, ClickStack is announced as a new open-source observability solution built on ClickHouse. It delivers a complete and out-of-the-box experience for logs, metrics, traces, and session replay, powered by the performance and efficiency of ClickHouse. This modern approach breaks away from traditional "three pillars" models and eliminates complexity in stitching together siloed telemetry sources. With ClickStack, teams can enjoy fast search, fast aggregations, and high-cardinality data handling without sacrificing cost or scalability. The solution is built on HyperDX, an open-source observability layer purpose-built on ClickHouse, which brings standards-based data collection, open-source first philosophy, and a UI tightly coupled to the engine for fast performance. ClickStack's modular design allows each layer to scale independently, making it easy to grow with your data and team without overhauling the stack. The solution is now available for everyone, including teams that previously relied on general-purpose visualization tools or third-party proprietary platforms built on ClickHouse.