Serilog sinks file - stops logging randomly for a few hours

[die-baas]

We have a development/test web application running that uses Serilog.Sinks.File for logging. For no reason we have been able to ascertain, logging will stop for a few hours and then resume by itself. It happens daily, at different times of the day.

Code to initialize

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
                .UseSerilog((hostingContext, loggerConfiguration) =>
                        loggerConfiguration.ReadFrom.Configuration(hostingContext.Configuration)
                );
    }

Appsettings.Json

  "Serilog": {
    "MinimumLevel": {
      "Default": "Warning",
      "Override": {
        "Default": "Information",
        "Microsoft": "Warning",
        "System": "Warning"
      }
    },
    "WriteTo": [
      {
        "Name": "File",
        "Args": {
          "path": "c:/temp/Logs/Log.txt",
          "retainedFileCountLimit": 30,
          "rollingInterval": "Day"
        }
      }
    ],
    "Enrich": [ "FromLogContext", "WithMachineName" ]
  },

Log file extract

2024-11-21 14:53:07.742 +02:00 [ERR] Client script error: Uncaught TypeError: n.includes is not a function 
2024-11-21 15:01:33.054 +02:00 [ERR] An unhandled exception has occurred while executing the request.
System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.Int32'.
2024-11-21 15:14:29.401 +02:00 [ERR] An unhandled exception has occurred while executing the request.
System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.Int32'.

****** Nothing logged for 3.5 hours ******

2024-11-21 18:44:38.579 +02:00 [ERR] Data error on db, Could not find stored procedure 'x'.
2024-11-21 18:49:24.851 +02:00 [ERR] Data error on db, Could not find stored procedure 'x'.
2024-11-21 18:56:36.714 +02:00 [ERR] Client script error: Uncaught TypeError: Cannot read properties of undefined (reading 'top') 
2024-11-21 19:03:23.891 +02:00 [ERR] Data error on db, Could not find stored procedure 'x'.
2024-11-21 19:15:35.261 +02:00 [ERR] Data error on db, Could not find stored procedure 'x'.
2024-11-21 19:24:13.869 +02:00 [ERR] Data error on db, Could not find stored procedure 'x'.

Please advise if it is a config issue or something else?

[nblumhardt]

Hi! Try enabling SelfLog and have this write to a different location (or directly to a remote endpoint) - if the issue is within the file sink it's likely some info will be produced there. HTH!