Should IoT Hub Service SDK's RegistryManager (and ServiceClient) be used as a singleton (HttpClient pattern) or is using var registryManager = ... preferred?
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Looking at RegistryManager's source code it creates its own non-static instance of HttpClientHelper which creates its own non-static instance of HttpClient which looks like an anti-pattern. This suggests one instance of the RegistryManager is preferred and a look at its code makes me think multiple users should be OK.
However I was not able to fine a piece of documentation that says that one instance of RegistryManager is supposed to be used as a singleton for the whole application.
