Datalust, the company behind Seq

Seq is the intelligent search, analysis, and alerting server built for modern structured logs and traces.

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News and announcements

Announcing Seq 2024.3

Friday, 03 May 2024

TL;DR: With Seq 2024.3, Seq gains user-defined high-cardinality indexes, its first new index type since the introduction of signal indexes back in 2018! If you're eager to skip to the binaries and dig around for yourself, you can get MSIs at https://datalust.co/download, or

Faster searches with property indexes

Tuesday, 30 April 2024

Now in preview, Seq 2024.3 introduces a new index type on event properties, known as expression indexes. Under the right circumstances, expression indexes reduce search time from minutes to milliseconds.

Expression indexes are created using the context menu on an event property. A property like OrderId is a strong

Seq 2024.2 released 🎉

Wednesday, 27 March 2024

TL;DR: for the latest UX and performance improvements, pull datalust/seq:latest from Docker Hub, or grab the MSI from datalust.co/download.

Seq 2024.2 is ready to go! Few releases come together as smoothly as this one has. We allocated some time after the major tracing-related changes

New from Datalust

On .NET Live - Application logs and diagnostics with Serilog

Nicholas Blumhardt talks application diagnostics with Cecil Phillip in On .NET Live.

.NET Rocks! #1647 - Rust and C# with Ashley Mannix

Ashley Mannix talks with Carl and Richard about the combination of Rust and C# used at Datalust.

C# and Rust: Combining Managed and Unmanaged Code Without Sacrificing Safety, NDC Oslo 2019

Ashley Mannix explores the tools that .NET and Rust give us to design and build safe and robust hybrid applications.

Parsing in C# from First Principles, NDC Sydney 2018

Nicholas Blumhardt talks about Superpower, the library we built for parsing SQL queries in Seq, and the foundational principles behind it.

Open Source and the Future of Seq

Brendan Richards interviews Nicholas Blumhardt about Open Source, Rust, Seq, Serilog, and more, in this AMA from NDC Sydney 2018.

Using Structured Logging for Production Insight

Microsoft's Damian Brady and Nicholas Blumhardt talk structured logging in this episode of The DevOps Lab.

.NET Rocks! #1466 - The Evolution of Serilog

Richard Campbell, Carl Franklin, and Nicholas Blumhardt talk all things logging, diagnostics, and monitoring in this .NET Rocks! episode recorded at NDC Oslo 2017.

Serilog: Instrumentation that Works for You, NDC Oslo 2017

Nicholas Blumhardt presents a complete walk-through of Serilog and modern structured logging at NDC Oslo 2017.