Serilog Multiple Sinks Not Working

Question

I'm using serilog to log all the Web API trace events in to one file and all the code debug to another file by the below code:

The problem is that the trace.json is also logging Debug events as well which I suspect is because of the minimumLevel filter.

How do I separate the events into two files ?

Tried this Question, but it doesn't write the file at all.

Using latest serilog version.

Log.Logger = new LoggerConfiguration()
.WriteTo.Trace(outputTemplate: "{Timestamp} [{Level}] ({HttpRequestId}|{UserName}) {Message}{NewLine}{Exception}")
.MinimumLevel.Debug()
.WriteTo.Sink(new FileSink(@"E:\log.json", new JsonFormatter(false, null, true), null), LogEventLevel.Debug)
.MinimumLevel.Verbose()
.WriteTo.Sink(new FileSink(@"E:\trace.json", new JsonFormatter(false, null, true), null), LogEventLevel.Verbose)
.Enrich.With<HttpRequestIdEnricher>()
.Enrich.With<UserNameEnricher>()
.Enrich.WithProperty("App", "CarbonFactoryERP")
.CreateLogger();

and below is how I call the logger:

Log.Logger.Debug("Web API Register Method started at {TimeStamp}",DateTime.UtcNow);

Log.Logger.Verbose("{TimeStamp} {Operation} {Operator} {Message} {Category}", rec.Timestamp, rec.Operation, rec.Operator, rec.Message, rec.Category);

Answer 1

This is the expected behavior of Serilog sinks. The minimum level parameter specifies only the minimum, as you'd expect - not an exact level match.

To get around this and write only a specific level to a sink, you can create a separate logging pipeline with the restriction applied and use that:

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Verbose()
    .WriteTo.Logger(config => config
        .Filter.ByIncludingOnly(e => e.Level == LogEventLevel.Debug)
        .WriteTo.Sink(new FileSink(@"E:\trace.json", ...))
    // Write to other sinks here

(May need a few typo corrections, working from memory.)