In grafana/mimir#790 we've removed metric.Metric in favour of model.Metric. The next step could be just moving to labels.Labels in MetricsForLabelMatchers() instead of model.Metric. This could also save some memory allocations due to type casting.

Is your feature request related to a problem? Please describe.
It's cumbersome to create the same step twice.

Describe the solution you'd like
Add a button to duplicate a step in the pipeline editor.

Ideas
We could combine this with some other ideas in a context menu (right click).

Credit to Serhii Ostapchuk for contributing this on Slack.