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A look back at the later half of 2025 in the world of ClickStack.

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ClickStack: A (half) year in review

Most AI SRE tools sound smart but fall apart in real incidents. Manveer Chawla explains why the problem isn’t the model, it’s the observability foundation, and how fixing that changes everything.

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Your AI SRE needs better observability, not bigger models.

At ClickHouse, we don't like the word "impossible." We believe that with the right tools, everything is a data problem. To prove it, we decided to complete the 2025 Advent of Code unconventionally: using pure ClickHouse SQL.

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Solving the "Impossible" in ClickHouse: Advent of Code 2025

Have a look at some of the most notable demos we built this year, and how they help people feel the speed of ClickHouse through real, hands-on examples.

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A look back at 2025 demo development at ClickHouse

A collection of my favorite technology blogs

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Good technology blogs: a reading list for the holidays

Over 100 functions were added to ClickHouse in 2025. These were some of my favorites.

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New functions you might have missed in 2025

A look back at some of my favorite benchmark-backed ClickHouse blog posts this year, and the lessons they revealed about performance in practice.

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What really matters for performance: lessons from a year of benchmarks

Looking back at Alexey's favorite ClickHouse features of the year.

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Alexey's favorite features of 2025

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Taming PostgreSQL GUC “extra” Data

An annotated version of Alexey's presentation at the P99 conference on the use of Rust in ClickHouse.

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How to use Rust in ClickHouse: avoiding a full rewrite

A first-person engineering deep dive into how ClickHouse parallelized aggregation merges for FixedHashMap, including design choices, false starts, and performance trade-offs.

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Parallelizing ClickHouse aggregation merge for fixed hash map

ClickHouse 25.11 is here! In this post, you will learn about parallel merge for small GROUP BY, projections as secondary indices, and more!

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ClickHouse Release 25.11

Discover what’s new in ClickStack this month, including service maps, root span filtering, Incident.io integration, and more!

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What's new in ClickStack. November '25.

We benchmarked the five major cloud data warehouses at 1B–100B rows using their real billing models to measure performance per dollar. Results show how cost-performance shifts as data grows.

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How the 5 major cloud data warehouses compare on cost-performance

This guide explains how the five major cloud data warehouses—Snowflake, Databricks, ClickHouse Cloud, BigQuery, and Redshift—allocate, meter, and bill compute, giving engineers a clear understanding of what the billing units mean and how to compare them.

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How the 5 major cloud data warehouses really bill you: A unified, engineer-friendly guide

Mike Shi, Head of Observability at ClickHouse, reflects on a pivotal year building ClickStack and learning from users. From cardinality and trace-first systems to OpenTelemetry and AI SRE, he shares what changed in 2025 and what matters next.

Blog

Observability - a year in review