How can I flush logging before terminating the actor system?

Question

I'm using Serilog and I notice when shutting down the actor system, not all outstanding log messages have been processed before custom loggers like Serilog are removed. Because of this, a bunch of messages are no longer sent to the Serilog sink and they end up in the default logger instead.

As a workaround, I use this in a ReceiveAsync handler:

await Task.Delay(TimeSpan.FromSeconds(5));
Context.System.Terminate();

I can probably use an AutoResetEvent or similar in a non-async handler or an FSM OnTermination handler.

The workaround above is just that though, a workaround. Is there a way to flush the logs? Note that I already flush Serilog before shutting down the actor system, that part works fine.

Answer 1

If you're using the global Log class, call Log.CloseAndFlush() before termination.

If you're using an IoC container or similar to manage a Logger instance separately, that's not assigned to the global Log.Logger property, make sure the container (or your app code) Dispose()s the logger instance before termination.