Regularly we get a question about result in Compass aggregation builder preview and actual result of the pipeline are different.

The most common cause for this is the limit of the number of documents, consumed by blocking stages like $group.

It would be great if the fact that preview might be incomplete could be stated somewhere in the UI.

For example, in Text view, it just straight up says Pipeline Output when in fact it is just a preview based on limited input.

In Stages view it also says "Output after <..> stage" without implying any limits.