October 2015 Update

Seq releases

Since our last update, version 2.3 shipped, including some huge efficiency wins, and a whole bunch of bug fixes.

Seq 2.4 is also just around the corner, and continues the theme of making sure Seq can keep up with our customers.

Version 2.4.1-pre is the first build of Seq to make use of real-time compaction (on Windows 8.1 and Windows Server 2012 R2), eliminating the heavy disk I/O spikes and space requirements sometimes incurred by periodic compaction.

Further optimization of filter execution also brings more performance gains in 2.4, especially for the complex filters associated with signals.

The current stable and preview releases are available on the download page of the Seq website.

From around the blogosphere...

  • Logging to Seq with IdentityServer3 - Dominick Baier shows how the combination of Serilog and Seq make it easy to surface diagnostics from this popular authentication component.
  • Enriching ServiceStack exceptions - This blog post from Scott Mackay demonstrates a hugely valuable technique for exception logging that can add useful properties from any exception type (not just for ServiceStack!)
  • Use Seq event types in flat log files - A short post from Nick. Recommended reading if you use flat log files alongside your Seq logs.

We love reading about how .NET developers are using structured logging to make life easier and more fun. Tweet us if you know of something we should share with the Seq community!


With Seq 2 now feeling very well-rounded, it's time to start sharing some of our plans for what's coming down the line.

The first feature scheduled for Seq's next major version is aggregate queries, like min, max, sum, count, mean and percentile. Being able to roll up values over a time intervals is fundamental to a whole range of scenarios.

To enable this in Seq we're extending the query syntax to borrow some familiar SQL constructs:

select mean(OrderSize) group by StoreId, time(1h)

In a stream of order processing events, this query will return the average order size, per store, across one hour intervals.

As you can imagine, aggregate query support opens up a lot of exciting analysis opportunities – we can't wait to land this change. A lot of code is written, but there's still plenty to go. More details will be posted here once we have a working preview for everyone to try.

Documentation updates

The Seq documentation continues to expand. If there are any topics you'd like to see added to the documentation, please reply!

Recently added content includes:

  • Azure Installation Guide - a handy reference whether it is your first time setting up an Azure virtual machine, or if you just need a checklist. to avoid missing the pesky Windows Firewall configuration step!
  • POSTing Raw Events - send events to Seq from practically anywhere using HTTP and a simple JSON format.