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This function has no effect on the instance. It is intended to be a no-op.
It has the following use cases:
IrisTcpServerinstance from a client or the client instance from the
Benchmarking. Ping can optionally return a dummy payload, which could, for example, be any or all of the following:
Instances that do not support
instance_ping() must return
E_function_not_supported_by_instance, although instances are
encouraged to implement this trivial function.