Critical Error Behavior

NuGet Package: NServiceBus.Hosting.Azure (8.x)
Target Version: NServiceBus 7.x
The NServiceBus Azure Host package is deprecated as of Version 9 as Microft has deprecated the Cloud Service hosting model. Users are recommended to switch to a different cloud hosting model.

Handling critical errors

Versions 6.2.2 and above

The Azure host is terminated on critical errors by default. When the host is terminated, the Azure Fabric controller will restart the host automatically.

Versions 6.2.1 and below

The Azure host is not terminated on critical errors by default and only shuts down the bus. This would cause the role not to process messages until the role host is restarted. To address this (probably undesired) behavior, implement a critical errors action that shuts down the host process instead.

// Configuring how NServiceBus handles critical errors
    onCriticalError: context =>
        var output = $"Critical exception: '{context.Error}'";
        log.Error(output, context.Exception);
        if (Environment.UserInteractive)
            // so that user can see on their screen the problem

        var fatalMessage = $"Critical error:\n{context.Error}\nShutting down.";
        Environment.FailFast(fatalMessage, context.Exception);
        return Task.CompletedTask;

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