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serilog

4 posts

2026-10-26 dotnet csharp logging

How to use a different Serilog output template per log level from appsettings.json

outputTemplate is fixed per sink, so per-level formatting needs either an ExpressionTemplate with {#if @l ...} blocks or two Logger sub-loggers with ByIncludingOnly / ByExcluding filters. Both configured purely from appsettings.json, tested on Serilog 4.4, Serilog.Settings.Configuration 10.0.1 and Serilog.Expressions 5.0.

2026-09-21 aspnetcore dotnet-10 logging

How to add the current user id to every log entry in ASP.NET Core

A BeginScope middleware misses the exception handler's error log and the Request finished line. Register an ILogEnricher that reads the user from IHttpContextAccessor, open a scope only when work leaves the request, and watch out for Serilog's AddSerilog silently cancelling enrichment.

2026-06-05 migration serilog opentelemetry

Migrate from Serilog to OpenTelemetry logging in .NET 11

A step-by-step guide to moving a .NET 11 app off Serilog and onto OpenTelemetry logging: the low-risk Serilog.Sinks.OpenTelemetry bridge, the full Microsoft.Extensions.Logging cut-over, what breaks, how to verify, and how to roll back.

2026-05-01 csharp dotnet dotnet-11

How to set up structured logging with Serilog and Seq in .NET 11

A complete guide to wiring Serilog 4.x and Seq 2025.2 into a .NET 11 ASP.NET Core app: AddSerilog vs UseSerilog, two-stage bootstrap logging, JSON configuration, enrichers, request logging, OpenTelemetry trace correlation, API keys, and the production gotchas around buffering, retention, and signal level.