This is a Serilog ILogConsumer and ITelemetryConsumer for Orleans. Default-constructed instances (ie, OrleansConfiguration.xml) will write incoming log messages and trace events to the default Serilog.Log.Logger. You can also create instances in code and which will allow you to configure the Serilog logging instance.

Add a TelemetryConsumer element to the OrleansConfiguration.xml file like this:

<Defaults>
  <Telemetry>
    <TelemetryConsumer Assembly="Orleans.Telemetry.SerilogConsumer" Type="Orleans.Telemetry.SerilogConsumer.SerilogConsumer" />
  </Telemetry>
</Defaults>

Or register in code before initializing the Orleans Silo:

var logger = new Serilog.LoggerConfiguration()
    .WriteTo.LiterateConsole()
    .CreateLogger();
var serilogConsumer = new SerilogConsumer(logger);

LogManager.LogConsumers.Add(serilogConsumer);
LogManager.TelemetryConsumers.Add(serilogConsumer);