Seq
@datalust.co
The self-hosted search, analysis, and alerting server
built for structured logs and traces. Also available at https://social.datalust.co/@seq. 🇦🇺
built for structured logs and traces. Also available at https://social.datalust.co/@seq. 🇦🇺
January update! datalust.co/blog/jan-eng...
January Engineering Update
datalust.co
January 27, 2026 at 4:17 AM
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
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
What's New in 2025.2?
datalust.co
January 27, 2026 at 2:36 AM
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
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.
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.
December 17, 2025 at 6:41 AM
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.
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.
Here's Ashley Mannix sharing his experiences shepherding Seq's high-performance #rustlang codebase through back-to-back years of rapid growth.
December 16, 2025 at 10:58 PM
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.
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...
December Engineering Update
datalust.co
December 5, 2025 at 4:56 AM
December Engineering Update: datalust.co/blog/decembe...
Reposted by Seq
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 🧪
October 29, 2025 at 10:00 PM
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 🧪
Reposted by Seq
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.
Head over to dddadelaide.com to find out more and buy your ticket before they're all gone. Less than two weeks to go.
November 9, 2025 at 11:07 PM
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.
Head over to dddadelaide.com to find out more and buy your ticket before they're all gone. Less than two weeks to go.
What are we working on, now? 👀 datalust.co/blog/what-ar...
What are we working on, now?
datalust.co
November 4, 2025 at 9:11 AM
What are we working on, now? 👀 datalust.co/blog/what-ar...
Reposted by Seq
👏 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.
Community events like DDD Brisbane wouldn’t be possible without the support of sponsors who believe in building and strengthening the local developer community.
September 1, 2025 at 6:31 AM
👏 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.
Community events like DDD Brisbane wouldn’t be possible without the support of sponsors who believe in building and strengthening the local developer community.
Reposted by Seq
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
August 12, 2025 at 11:19 AM
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.
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.
July 24, 2025 at 1:44 AM
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.
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...
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
June 18, 2025 at 9:56 PM
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...
github.com/datalust/sup...
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! ☺️
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
June 18, 2025 at 5:23 AM
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! ☺️
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 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...
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
June 17, 2025 at 11:12 PM
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...
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...
Analyzing the distribution of elapsed time and other telemetry metrics: a primer on averages, percentiles, histograms and heatmaps 🔥
blog.datalust.co/analyzing-th...
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
June 4, 2025 at 5:36 AM
Analyzing the distribution of elapsed time and other telemetry metrics: a primer on averages, percentiles, histograms and heatmaps 🔥
blog.datalust.co/analyzing-th...
blog.datalust.co/analyzing-th...
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...
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...
June 2, 2025 at 12:15 AM
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...
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...
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 latest 2025.1 build brings this back; update, jump into your user preferences, and select "Classic Light" from the theme drop-down 😊
May 29, 2025 at 4:38 AM
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 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...
May 28, 2025 at 6:19 AM
The nifty color palette we adopted here is based on Matteo Niccoli's perceptual rainbow palette, mycartablog.com/2013/02/21/p...
Introducing heatmaps: Seq now implements this popular visualization for three-dimensional data sets 😎
blog.datalust.co/introducing-...
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
May 28, 2025 at 6:01 AM
Introducing heatmaps: Seq now implements this popular visualization for three-dimensional data sets 😎
blog.datalust.co/introducing-...
blog.datalust.co/introducing-...
Data Replication in Seq Clusters - a new post on our engineering blog:
blog.datalust.co/data-replica...
blog.datalust.co/data-replica...
Data Replication in Seq Clusters
Now that we've seen how Seq clusters coordinate the leader and follower roles, let's look one layer further down the stack.
Log events and traces reach the cluster nodes via HTTP, and internally thes...
blog.datalust.co
May 28, 2025 at 3:09 AM
Data Replication in Seq Clusters - a new post on our engineering blog:
blog.datalust.co/data-replica...
blog.datalust.co/data-replica...
We've just pushed a tiny 2025.1 patch that fixes indexing on single-core machines/containers 😅
Multi-core boxes are unaffected and can ignore this one.
github.com/datalust/seq...
Multi-core boxes are unaffected and can ignore this one.
github.com/datalust/seq...
2025.1 Patch 1 Milestone · datalust/seq-tickets
Issues, design discussions and feature roadmap for the Seq log server - 2025.1 Patch 1 Milestone · datalust/seq-tickets
github.com
May 22, 2025 at 12:59 AM
We've just pushed a tiny 2025.1 patch that fixes indexing on single-core machines/containers 😅
Multi-core boxes are unaffected and can ignore this one.
github.com/datalust/seq...
Multi-core boxes are unaffected and can ignore this one.
github.com/datalust/seq...
Self-hosting's "moment" is set to be a long one.
We saw the privacy advantages a decade ago, and the momentum is only getting stronger.
We saw the privacy advantages a decade ago, and the momentum is only getting stronger.
May 21, 2025 at 6:30 AM
Self-hosting's "moment" is set to be a long one.
We saw the privacy advantages a decade ago, and the momentum is only getting stronger.
We saw the privacy advantages a decade ago, and the momentum is only getting stronger.
A peek into the delicate machinery that adapts a running Seq node to its role in the cluster: blog.datalust.co/leader-elect...
May 21, 2025 at 5:43 AM
A peek into the delicate machinery that adapts a running Seq node to its role in the cluster: blog.datalust.co/leader-elect...