Kubernetes hosting guide suggests an environment variable that doesn't work

[highlyunavailable]

In the Kubernetes hosting guide, it suggests setting the environment variable DOTNET_SHUTDOWNTIMEOUTSECONDS to 120. This environment variable does not set the Host shutdown timeout, and it is not respected. This value should be set at in the application code via siloBuilder.Configure<HostOptions>(options => options.ShutdownTimeout = TimeSpan.FromMinutes(2)); in the UseOrleans call.

The PR that makes this respected in dotnet core, dotnet/runtime#44080 is not actually merged into a released branch - see 5.0.6 HostOptions.cs.

I'm happy to fix this myself, but I'm not sure the best way to say "make sure your shutdown timeout is set right" in the context of Kubernetes.

[ReubenBond]

Thanks for reporting that, @highlyunavailable! We could comment it out in the yaml, with a link to the fix, and add the code you suggested with a similar comment.