My org is not using separate clusters, but we do make use of different agent queues. Rather than seeing “Default” for the cluster name on every step, it would be more useful to see the queue name displayed instead.
Hey @allievt 
It sounds like you’re talking about the queue name that is shown on the step when you’re looking at it in the UI, is that correct?
If so, default is the queue that the step is running on, and if a step is running on a different queue it should reflect in the UI.
If this isn’t the case, could you reach out to support@buildkite.com and let us know some more details about what you’re seeing, with some links to your builds so we can investigate?