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

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

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

Improved and updated email notifications

Thursday, 29 February 2024

Introducing the new Seq.App.Mail.* packages for SMTP and Microsoft365 email.

A lot has changed since the first email notification plugin was written for Seq! SMTP is alive and well, but .NET's SmtpClient is all but dead and gone. Services like Amazon SES and Microsoft 365 provide

Working with Nested Event Properties

Thursday, 22 February 2024

Seq 2024.1 introduced a change to the default display of nested event properties. Previous versions of Seq rendered collapsed nested structures that could be expanded to access a context menu on the nested properties. The newer scheme flattens nested properties into dotted names and makes the regular property context

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.