![]() If you type an error message directly into Seq's search box, you'll often find some events that contain it: Something's gone wrong, an error message or error id has been reported, and application logs are often where we turn to track down the root cause. Many diagnostic sessions start with an error. As searching for log events is the first thing most developers do with Seq, it's conventional to introduce the simpler search expressions first, before examining queries for log analysis. Seq's query language meets these goals through two modes, based around a common, core syntax. Log analysis is much more like programming in this context. Especially when results are numeric or aggregated from many records, the underlying computation needs to behave exactly as the user expects. Log search is usually ad-hoc and exploratory - and often done in a hurry!Īs a language for log analysis, the language must be clear and precise. Second, it's a language for log analysis: computing statistics and revealing patterns in aggregated log data.Īs a language for log search, the Seq query language needs to be ergonmic, forgiving, and terse. First, it's the foundation of quick and easy log searching: finding structured log events that match some criteria. The Seq query language serves two closely related, yet distinct, purposes. This is what the Seq query language is all about! Searching and analyzing structured logs Seq collects logs from applications and services, to drive dashboarding and alerts, and to make debugging easier when things go wrong in production.Īll of these tasks revolve around searching and analyzing large numbers of events, trying to spot patterns and anomalies, or finding specific events based on their properties. Now seems like a good time to reintroduce our much-loved query language from the ground, up! Seq 2020.1 includes some interesting query language improvements, including object literals, a universal ci case-insensitive text comparison modifier, conditional expressions, and a bunch of new built-ins. Menu A Seq query language primer 09 July 2020
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