Example of Assign() is slightly misleading

Description

While consumer group is not used in Assign() scenarios, it still needs to be provided for whatever reason. In the samples new Guid() is used for naming that group. It seems to be misleading, because in most scenarios Guids are used as unique identifiers, but in this case it is just a constant (00000000-0000-0000-0000-000000000000).

As a result developers often get incorrect assumption that consumer group names for Assign() should be unique (even with each service restart). They just blindly miss that Guid is created via new Guid() but not Guid.NewGuid(). And it ends up with hundreds of empty consumer groups with Guid names in clusters.

I seems to be better to specify some hardcoded constant (and probably explicitly state that that value could be used for ALL services if needed).

How to reproduce

• Change this line to GroupId = Guid.NewGuid().ToString(),
• Run sample few times
• New consumer group with unique name is created each time. Old groups are not removed.

[bartelink]

new Guid()

Perhaps Guid.Empty might be a better way to convey the fact that the value should remain stable?

Though I’d favor "TestConsumerGroupName" or something more explicit

[anchitj]

Closing the issue as the example has been fixed now.