How can I flush all loggers in a dotnet core appliation just before doing a Environment.Exit()

Basically I have the old known issue of an application crashing and having no debug logs, because the application terminated before it could write the logs.

A classic approach is to catch all Exceptions in main and to flush all log buffers in the exception block. Furthermore adding a sleep to reduce the restart speed and allow the buffers to finish the flush.

I use serilog, and I found this ticket: https://github.com/serilog/serilog/issues/1111

It suggests to do as I suggested (code pasted below), but I am uncertain it will close and flush all loggers and not just the main logger.

1. Will I have to flush more loggers, to get all logs?
2. This example assumes, that ConfigureLogging() sets up the logger, but in a real asp .netcore main you usually don't have the logger set up, how do I get to do that?

public static int Main(string[] args)
{
    ConfigureLogging(); // set up Serilog

    try
    {
        Log.Logger.Information("Custom.API Server is starting.");
        var webHost = BuildWebHost(args);
        webHost.Run();

        Log.Logger.Information("Custom.API Server is starting.");
        return 0;
    }
    catch (Exception ex)
    {
        Log.Fatal(ex, "Host terminated unexpectedly.");
        return 1;
    }
    finally
    {
        Log.CloseAndFlush();
        Thread.Sleep(2000); // give serilog / seq time to flush the messages
    }
}