These docs are for v2023.2. Click to read the latest docs for v2024.3.

What's New in 2023.2?

Seq 2023.2 adds a native ingestion endpoint for the OpenTelemetry logs protocol (OTLP).

The release milestone on GitHub lists more improvements and bug fixes included in 2023.2.

What's new in 2023.1?

Seq 2023.1 introduces a brand new query engine, built in Rust, that parallelizes work efficiently across large numbers of cores, makes better use of signal indexes to accelerate queries, and works in harmony with the host operating system to manage memory safely in containerized environments.


100 GB stream, AWS Graviton im4gn.4xlarge instance, 2 minutes 20 seconds vs 0.8 seconds.

🔥 Extreme sparse index performance — a new, unified storage architecture makes better use of indexes when querying recent events, yielding order-of-magnitude execution time improvements on many searches.

🤹‍♀️ Smooth multicore scaling — the new query engine utilizes as many cores as the host can provide, leading to better overall utilization and faster query response times.

Easier management in Docker and Kubernetes — a range of updates make Seq work in harmony with container hosts, in a wider range of environments.

For a complete list of bug fixes and improvements shipping with Seq 2023.1, please see the release milestone on GitHub.

What's new in 2022.1?

Seq 2022.1 completely reshapes the signal bar. Large signal lists are easier to work with, search history is now searchable, there's a better signal editor, and a new variables window that supports a unique and powerful diagnostic experience.


Seq 2022.1, showing the new signal bar organization, and query syntax for assigning a variable.

Active signals are now displayed as tags above the result list, so that the scope of the current result set is clear even when the signal list is off-screen.

Variables allow property values and other useful information to be given names and then used within queries and searches. By assigning a large or complex object to a named variable such as $request, it's possible to inspect and evaluate expressions against its subproperties with queries like select $response.Orders[1].ShippedAt.

The coalsece() and concat() query functions now support variable-length argument lists, and substring()'s third length argument is now optional. The query language function and operator documentation also received a major overhaul, and should be more accurate, detailed, and consistent than the earlier version.

New Project Owner and Organization Administrator roles provide the option to grant more capabilities to users while limiting access to critical system-level administration features.

For a complete list of 2021.1's improvements and bug fixes, see the release milestone on GitHub.

What's new in 2021.4?

Seq 2021.4 adds 64-bit ARM platform support to the datalust/seq Docker image. The image is tested on Apple Silicon (M1 and later Macs), AWS Graviton, and Raspberry Pi 4.


Machines running the preview ARM support included in some Seq 2021.3 builds must be upgraded directly to Seq 2021.4 to ensure compatibility with future Seq releases.

Also in 2021.4:

The release milestone on GitHub lists some additional small bug fixes that made it into the 2021.4 release.

What's new in 2021.3?

In Seq 2021.3, Alerts get their own top-level status-oriented dashboard, a much better editing experience, and rich, multi-channel notifications.


Seq 2021.3 Alerts dashboard, showing notification history and current trigger status of several alerts.

Integrated disaster recovery (DR) and support for zero-downtime upgrades make managing Seq easier in enterprise and datacenter environments.

Hosting Seq in Docker gets a major upgrade, with a new secret store, init script support, support for serving HTTPS without a reverse proxy, better Linux virtual memory manager integration, and a new shell entrypoint for performing maintenance.

Seq 2021.3 includes improvements across the entire product:

  • The search bar button layout and icons have been redesigned, providing quick access to JSON and CSV export
  • The Events screen date range picker gains support for millisecond precision
  • PostgreSQL is added alongside SQL Server/Azure SQL Database for robust external metadata storage
  • The Seq query language gains let bindings and lambda syntax for collection search operations
  • A dedicated /health endpoint, and a range of new seqcli commands make deploying and operating Seq 2021.3 a breeze
  • Seq can now be installed and run under a Group Managed Service Account (gMSA) on Windows Server
  • Signals, dashboards, queries, retention policies, and workspaces can now be exported, imported, and synchronized between servers with seqcli template export and seqcli template import
  • Secret key providers enable storing the primary Seq encryption key in an external key management service

Check out the release milestone on GitHub for a full list of included features and bug fixes, and the upgrade guide if you have an existing Seq instance to update.

What's new in 2021.2?

Seq 2021.2 extends Seq's built-in query language with the new DatePart() and OffsetIn() functions.

Seq 2021.2 uses .NET 5.0.4, which addresses a remote-code-execution vulnerability in .NET 5.

For detailed release contents, see the GitHub milestone. Seq 2021.2 also rolls up the final Seq 2021.1 patch release; see also the 2021.1.5424 milestone.

What's new in 2021.1?

Seq 2021.1 includes:

  • Collapse all is now an option on nested objects in event properties
  • OpenID Connect and Azure Active Directory authentication now work properly under Kubernetes ingress paths
  • The dashboard Save button now enables immediately when typing in the query editor
  • Seq 2021.1 uses .NET 5.0.2, which addresses a denial-of-service vulnerability in .NET 5
  • Various query parsing and translation bugs have been fixed
  • seqcli user create now applies user roles correctly from the command-line

For detailed release contents, see the GitHub milestone.

What's new in 2020.5?

Seq 2020.5 is the first Seq version to run under .NET 5, bringing further improvements in execution time for some fundamental queries:


Seq 2020.5 query performance against 2020.4 and 5.1, with data served from memory and from/to dates specified.

In 2020.5, Seq plug-in apps and inputs run under the open-source seqcli app host, making development easier and cross-platform deployment more reliable.

We've also managed to save some bytes to shrink the Windows installer (34%) and Docker image (16%, compressed).

Oh, and workspaces have been redesigned: you can now associate default signals with a workspace, and they'll be activated when you switch between workspaces 😎.

For detailed release contents, see the GitHub milestone.


For additional upgrade instructions, see the Upgrading guide.

What's new in 2020.4?

Seq 2020.4 is all about the Storage screen — see exactly where disk space is going, and how effective retention policies are at freeing up resources.

You can find it under Data > Storage.


Seq 2020.4 storage view, showing retention policy markers.

The Settings > Users list is also now fully searchable (a relief for customers with hundreds of active users!); dark and light modes can be set to follow your operating system's dark/light setting; all queries are now fully cancellable; entire events can be easily copied as JSON; and, as always, there's a host of other small fixes and improvements.

For detailed release contents, see the GitHub milestone.

What's new in 2020.3?

Seq 2020.3 fixes a number of issues, and improves stability for customers using Azure Active Directory (AAD) authentication. We've also made some much-anticipated changes to live tailing to make live log streams more responsive and easier to follow.


Improved live tailing in Seq 2020.3.

For detailed release contents, see the GitHub milestone.

What's new in 2020.2?

Seq 2020.2 adds an improved structured data viewer that simplifies working with nested objects, and support for SQL-style -- comments in queries and search expressions.


The Seq 2020.2 structured data viewer in action, searching for a value in an array of nested objects.

You'll also find a range of small enhancements and bug fixes.

For detailed release contents, see the GitHub milestone.

What's new in 2020.1?

Seq 2020.1 is packed with improvements over Seq 5.1. We've written this quick introduction to cover the highlights.

The Ingestion screen

Managing log ingestion is the key to controlling costs and optimizing search performance. Seq 2020.1 makes this much, much easier, by providing a detailed breakdown of log traffic from the ingestion API and custom inputs.


The Seq 2020.1 Ingestion screen.

Learn more about managing ingestion.

OpenID Connect authentication

OpenID Connect is the emerging standard for authentication using OAuth 2.0. Many teams use OpenID Connect providers like Auth0 to implement single-sign-on (SSO), and now Seq can use OpenID Connect to authenticate users, too!

Learn more about configuring OpenID Connect authentication.

Full-featured custom inputs

Custom inputs including GELF, Syslog, RabbitMQ, Health Check, and others, now get all the features of Seq's built-in HTTP ingestion pipeline!

  • View the rate of ingestion per input
  • Set minimum levels and apply filters to reduce noise
  • Use server-allocated timestamps if client clocks are off
  • Attach properties to identify events coming from each input

For an example of a very useful custom input, check out the documentation for Health Checks.

Query language improvements

2020.1 continues to improve upon Seq’s query language, making it easier to express a variety of queries. Additions include:

  • Universal case-insensitive (ci) modifier, supporting case-insensitive group by, property access, comparisons, and more
  • Conditional expressions with if/then/else
  • Object literals {a: 'hello', b: 42}
  • Structural equality comparisons for arrays and objects (like EventId in ASP.NET Core!)
  • interval() in queries that group by time()
  • select * and @Document now reflect the underlying JSON data model
  • Better error reporting for search expressions
  • Variadic coalesce() function - coalesce(A, B, C, ...)
  • Keys() and Values() built-in functions for collection manipulation
  • ToJson() and FromJson() for manipulating JSON string data
  • ToUpper() and ToLower() built-ins
  • Column aliases in groupings - group by A as b

Native, parallel query execution

The underlying query engine in Seq 2020.1 includes a new native implementation in Rust that squeezes more performance from the same hardware.

Pushing more query execution into native code puts less pressure on the .NET garbage collector, leading to lower resource usage, faster execution, and fewer GC pauses.

We've taken advantage of the more predictable query evaluation to also introduce query parallelization, speeding up most queries noticeably.

Set an initial username and password during installation

On Windows, an administrator username and password can now be set during installation through the setup wizard. On Docker/Linux, the SEQ_FIRSTRUN_ADMINUSERNAME and SEQ_FIRSTRUN_ADMINPASSWORD variables (or --default-admin-password-stdin flag) provide equivalent functionality.

Theme switcher

🌞 in the morning, 🌚 in the evening? The quick theme switcher in the 2020.1 navbar makes dark or light mode a single click away.

Revised keyboard navigation

The tab order and focus styles have been improved throughout, making it easier and faster to move between elements in the Seq UI without reaching for a mouse.

Improved administration UI

The administration UI in 2020.1 has had some additional attention.

  • View and cancel running queries from Diagnostics
  • View and cancel active alerts from all users in the new Alerts tab
  • Search API keys by token, prefix, attached properties, etc.
  • Filter and sort a selection of frequently-used tables

You can find detailed release notes in our 2020.1 issue tracker milestone.

What’s Next

Ready to upgrade? Seq 2020.5 is a highly-compatible, in-place upgrade from earlier versions. Most upgrades are as simple as running the installer or pulling the new Docker image, but if you have a custom integration into the Seq API, check out the full compatibility notes for all the details.