Paul Turley continues a series on doing Power BI the right way:
When designing a new data model, this is typically the first thing I do… For every fact table and for each large dimension table, I create a measure that returns the record count for that table. Users normally think about their data in business terms (like sums, ratios and averages) and not about how many records there are in a table. Record counts are a convenient sanity check for record completeness and distribution across groups; and may also be a good indicator for model size and performance.
Paul takes several passes at the problem, getting a bit deeper into it each time.