Using Serilog.ILogger in Azure Function

Question

I'm trying to use use Serilog.ILogger in my Azure function. I'm setting it up so I can add custom properties down the line. When I try to run the Azure function a console window pops up and shows the following error:

[2021-03-16T00:15:25.424Z] A host error has occurred during startup operation '6a853374-f99b-4ca4-8bde-8df8cc1e7e79'. [2021-03-16T00:15:25.426Z] func: Invalid host services. Microsoft.Azure.WebJobs.Script.WebHost: The following service registrations did not match the expected services: [2021-03-16T00:15:25.427Z] [Missing] ServiceType: Microsoft.Extensions.Logging.ILoggerProvider, Lifetime: Singleton, ImplementationType: Microsoft.Azure.WebJobs.Script.Diagnostics.FunctionFileLoggerProvider, Microsoft.Azure.WebJobs.Script, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null

This is the code that I'm using in my startup:

 public override void Configure(IFunctionsHostBuilder builder)
    {
        var serilogLogger = new LoggerConfiguration()
            .Enrich.FromLogContext()
            .WriteTo.ApplicationInsights(TelemetryConverter.Traces)
            .CreateLogger();
        builder
            .Services
            .AddHttpClient()
            .AddLogging(l =>
            {
                l.ClearProviders();
                l.AddSerilog(serilogLogger);
            })
            .AddSingleton(serilogLogger); 
   }

I'm also injecting an instance of ILogger<> into a few classes in my function too.

Any thoughts of what might be going wrong here ?

Sajeetharan · Accepted Answer · 2021-03-16 02:21:03Z

1

Can you try the following code?

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Serilog;
using Serilog.Configuration;
using Serilog.Events;


var logger = new LoggerConfiguration()
                .MinimumLevel.Debug()
                .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
                .Enrich.FromLogContext()
                .Enrich.WithComponentName(ComponentName)
                .Enrich.WithVersion()
                .WriteTo.Console()
                .WriteTo.AzureApplicationInsights(instrumentationKey)
                .CreateLogger();


 builder.Services.AddLogging(l =>
 {
    l.ClearProvidersExceptFunctionProviders();
    l.AddSerilog(logger);
 });

answered Mar 16, 2021 at 2:21

Sajeetharan

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3 Comments

HEldursi Over a year ago

It seems that this requires installing the Arcus Observability nuget package. Is there a way to do it without that?

wolfyuk Over a year ago

@HEldursi Have a look here

Tom Kerkhove Over a year ago

We also provide templates for you to scaffold projects templates.arcus-azure.net

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