Returns the record counts of a dataset's most recent successful import (or, for releases, the release build): numbers of names, taxa, synonyms, vernacular names, distributions, references and so on, including by-rank and by-gazetteer breakdowns.
Value
A one-row tibble of metrics. Breakdown maps such as
usagesByRankCount are returned as list-columns. NULL (with a message)
if the dataset has no import yet.