Serilog builder.Host and AddFilter

I have a a webapp using the terse .NET 6/7 serilog initialization:

var builder = WebApplication.CreateBuilder(args);

builder.Host.UseSerilog((ctx, lc) => {
  lc.WriteTo.File(
    logDir + "\\mylog.log"

  ).Filter.ByExcluding(le => {
    var s = le.RenderMessage();
    return s.StartsWith("Executing endpoint")
      || s.StartsWith("Executed endpoint")
      || s.StartsWith("User logged in.");
  });
});

I now want to filter some messages:

AddFilter("Microsoft.AspNetCore.SignalR", LogLevel.Debug);
AddFilter("Microsoft.AspNetCore.Http.Connections", LogLevel.Debug);

However I am not sure how to plug these AddFilter statements into the above builder

Any help ?

For a code based approach, use MinimumLevel.Override

builder.UseSerilog(
    (ctx, lc) => lc
        .WriteTo.File(logDir + "\\mylog.log")
        .Filter.ByExcluding(le => {
            var s = le.RenderMessage();
            return s.StartsWith("Executing endpoint")
                || s.StartsWith("Executed endpoint")
                || s.StartsWith("User logged in.");
        })
        .MinimumLevel.Override("Microsoft.AspNetCore.SignalR", Serilog.Events.LogEventLevel.Debug)
        .MinimumLevel.Override("Microsoft.AspNetCore.Http.Connections", Serilog.Events.LogEventLevel.Debug)
    );

For a configuration approach, use ReadFrom.Configuration

builder.UseSerilog(
    (ctx, lc) => lc
        .WriteTo.File(logDir + "\\mylog.log")
        .Filter.ByExcluding(le => {
            var s = le.RenderMessage();
            return s.StartsWith("Executing endpoint")
                || s.StartsWith("Executed endpoint")
                || s.StartsWith("User logged in.");
        })
        .ReadFrom.Configuration(ctx.Configuration)
    );

Your appsettings.json file should look something like below.
The log levels might be different.

{
    "Logging": {
        "LogLevel": {
            "Default": "Warning",
            "Microsoft": "Warning",
            "Microsoft.Hosting.Lifetime": "Warning"
        }
    },
    "Serilog": {
        "MinimumLevel": {
            "Default": "Warning",
            "Override": {
                "Microsoft.AspNetCore.SignalR": "Debug",
                "Microsoft.AspNetCore.Http.Connections": "Debug"
            }
        }
    }
}