We've migrated seqcli's internal data pipeline (ingest, search, tail) from piggy-backing awkwardly on Serilog, to a lean System.Text.Json-based model in the latest release 🎉 If you spot any regressions we've missed in our testing, please let us know 🙏😅 github.com/datalust/seq...

Metrics support is officially ready! Download the Seq 2026.1 MSI, or pull datalust/seq:latest to upgrade. Read the release announcement at: datalust.co/blog/seq-202...

Identical log/trace data sets in Seq 2025.2 and 2026.1, 64% lower on-disk footprint thanks to an all-new compression implementation! RTM in just a few days, now... 😁

A tiny update for today; if you have log and trace data in Seq that you'd like to mirror to an SIEM, alerting system, or another monitoring back-end, Seq.App.OpenTelemetry is the new thing to reach for: www.nuget.org/packages/seq...

Seq.App.OpenTelemetry 1.0.0-dev-00101

Package Description

nuget.org

A nice little write-up showing logging to Seq from #golang, using slog: robinsiep.com/blog/posts/g...

Telling the story right: efficient logging in Go

robinsiep.com

Seq.App.Slack now includes more alert detail inline 😎 Update to v2.0.1 of the package (or later) in Settings > Apps.

Seq 2026.1 previews are rolling out! Today's fresh build includes percentiles over metric histograms, `ContributingEventsUrl` in alert notifications, and a bunch of other updates. datalust/seq:preview, or datalust.co/download 😎

Seq 2026.1 previews are now shipping weekly! These add support for OpenTelemetry metrics ✨ and a completely new metrics discovery and visualization UI. Check out this post for how to get started: datalust.co/blog/metrics...

New blog post! A first look at interactive metrics debugging with Seq: datalust.co/blog/seq-met...

Tip of the day: sleuthing for slow spans? Combine the @Elapsed built-in with duration expressions and 💥!

January update! datalust.co/blog/jan-eng...

Seq's "What's New?" page has been cumulative since 2020.1. If you've skipped a release or two, it's a fantastic way to catch up quickly on anything you might have missed 🙂 datalust.co/docs/whats-new

This year we've been in the lucky intersection of features most requested by Seq users, and deeply interesting new tech to design and build. Heading into 2026 we have a lot to unpack! @liammclennan.bsky.social started with an overview of column stores at @dddbrisbane.bsky.social this month.

The Seq team rounded out 2025 at DDD Adelaide and then DDD Brisbane a month later, both fantastic community-oriented conferences. Here's Ashley Mannix sharing his experiences shepherding Seq's high-performance #rustlang codebase through back-to-back years of rapid growth.

December Engineering Update: datalust.co/blog/decembe...

Have you ever thought about having unit tests for your unit tests? 🤔 If so, decent chance your testing isn't catching the bugs you need and is just slowing you down ⏱️ @Ashley Mannix at #DDDAdelaide 2025 shows how to test complex software, challenging what a test is 🧪

Hey that's @liammclennan.bsky.social from @datalust.co speaking at @dddadelaide.bsky.social ! Head over to dddadelaide.com to find out more and buy your ticket before they're all gone. Less than two weeks to go.

DDD Adelaide | 22nd November 2025

DDD Adelaide is an inclusive non-profit conference for the Adelaide software community.

dddadelaide.com

DDD Adelaide@dddadelaide.bsky.social · 10mo ago

Liam McLennan shows us at #DDDAdelaide 2025 the power in using Metrics to gain observability at high volumes where logs simply don't work 📊. Join us to learn what metrics are, when they are useful, and how to actually collect and analyse them 📈🔍

What are we working on, now? 👀 datalust.co/blog/what-ar...

👏 A big thank you to Seq for coming on board as a Silver Sponsor for DDD Brisbane 2025! Community events like DDD Brisbane wouldn’t be possible without the support of sponsors who believe in building and strengthening the local developer community.

Huge thanks to @datalust.co, makers of Seq, for continuing to support DDD events. One of only two tech companies that came to the table for our crazy outback experiment. 🙇🙇🙇 Check out Seq at datalust.co

Seq Forwarder has moved! Seq's own handy little store-and-forward ingestion proxy has been rewritten as the `seqcli forwarder` command group: github.com/datalust/seq... The original Seq Forwarder repository has been archived, but past releases will remain available there.

Superpower 3.1.0 is a maintenance release with updated TFMs, index/range support on TextSpan, and a new Text() combinator for character parsers: github.com/datalust/sup...

Release v3.1.0 · datalust/superpower

#140 - target .NET 6 (@KodrAus) #143 - remove Gitter link (@liammclennan) #144 - remove unnecessary zero-length array allocation (@sq735) #149 - fix divide operator in example parser (@randomC0der)...

github.com

Seq 2025.2 🎉 blog.datalust.co/seq-2025-2-r... If you automate Seq deployments in your organization: we've tightened up initialization of new instances, so be sure to read the release notes this time around! ☺️

Seq 2025.2 Release

TL;DR: Seq 2025.2 is ready on datalust.co and as datalust/seq in your Docker container registry of choice. A number of improvements were in-flight during the recent Seq 2025.1 release, but came in ...

blog.datalust.co

Seq 2025.2 is on its way later today! This patch includes a few changes that missed the cut-off for inclusion in 2025.1; you can check out what's coming in: github.com/datalust/seq...

datalust/seq-tickets

Issues, design discussions and feature roadmap for the Seq log server - datalust/seq-tickets

github.com

Analyzing the distribution of elapsed time and other telemetry metrics: a primer on averages, percentiles, histograms and heatmaps 🔥 blog.datalust.co/analyzing-th...

Analyzing the distribution of elapsed time and other telemetry metrics

Telemetry data often includes numeric values that change over time. This is roughly the definition of an observability 'metric'. It is difficult to infer anything useful by looking at the values of a...

blog.datalust.co

Today's tiny quality-of-life improvement: If you regularly use the "From now" date range option, grab the latest 2025.1 patch and try Ctrl+Space N 💡 github.com/datalust/seq...

Work Sharing in Seq Clusters ✨ blog.datalust.co/work-sharing...

Work Sharing in Seq Clusters

We've reviewed leader election and replication in Seq clusters. While these are tricky to get right, and involve nontrivial code, they're dwarfed in complexity by work sharing, which is the basis of S...

blog.datalust.co

Fans of the "classic" light theme, we hear you! ❤️ The latest 2025.1 build brings this back; update, jump into your user preferences, and select "Classic Light" from the theme drop-down 😊

The nifty color palette we adopted here is based on Matteo Niccoli's perceptual rainbow palette, mycartablog.com/2013/02/21/p...

Seq@datalust.co · last yr.

Introducing heatmaps: Seq now implements this popular visualization for three-dimensional data sets 😎 blog.datalust.co/introducing-...

Introducing heatmaps: Seq now implements this popular visualization for three-dimensional data sets 😎 blog.datalust.co/introducing-...

Introducing Heatmaps

TL;DR: Heatmaps are a great way to visualize timing data over time. The canonical visualization of two dimensional data is the bar chart. The following screenshot shows a count of events at each logg...

blog.datalust.co