Seq

As explained in ASP.NET Core in Action, 3e

Seq is a structured log server and analysis tool for collecting, storing, searching, and filtering application log events.

Seq collects structured application logs and provides a web interface for searching, filtering, and analyzing them. It turns questions such as “Has this recipe error happened before?” into queries over log properties rather than painful text searches. section 26.5

A small ASP.NET Core application can send structured logs to Seq with a familiar provider setup:

• Install the Seq logging provider with the .NET CLI. section 26.5.1
• Call AddSeq() in Program.cs to send logs to the default local Seq URL. section 26.5.1
• Open the Seq web interface at http://localhost:5341, generate application activity, and inspect the resulting events. section 26.5.1
• Capture named message parameters, such as RecipeCount, as searchable structured properties. section 26.5.1

Figure 26.11 The Seq UI. Logs are presented as a list. You can view the structured logging details of individual logs, view analytics for logs in aggregate, and search by log properties.

Use the Seq UI to view logs individually, inspect their structured data, analyze events in aggregate, and search by log properties. section 26.5.1

How ASP.NET Core in Action, 3e covers it

How deep it goes

Explains installation, ASP.NET Core configuration, property capture, and UI querying, while deferring production customization details.

Examples

Uses recipe lookup warnings, recipe identifiers, RecipeCount properties, and the Seq web interface.

What it assumes

Assumes a working ASP.NET Core application and logging, while introducing structured properties and Seq setup.

What you can do after

Operate/configure Seq locally, send ASP.NET Core logs to it, and search events by structured properties.

How it connects

Connects structured logging with ASP.NET Core, logging providers, JSON, scopes, and log filtering.

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Related concepts

• ILoggerProviderkind of · ILoggerProvider is a .NET logging interface that creates logger instances associated with a logging destination or implementation.
• Elasticsearchalternative to · Elasticsearch is a distributed search and analytics engine that indexes data for searching, retrieval, and analysis.

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.