Ambiguous about whether the series key includes field keys

series cardinality: The number of unique database, measurement, tag set, and field key combinations in an InfluxDB instance.
series: A logical grouping of data defined by shared measurement, tag set, and field key.
InfluxDB glossary | InfluxDB OSS 1.8 Documentation

However, show series and show series exact cardinality is based on keys that exclude field keys, right?