I was a bit surpsied when my command with "--keep-daily=7" deleted (pruned) quite a lot until I realized that this meant to keep 7 days of data whatever the tags are.

Somehow this should be reflected in the documentation more clear that this will remove any data even if multiple hosts/data points are stored in the same repository and that the prefix flag should be used for per "host/data point" clean up.

Or the overall "keep-within"