metronome-group-keys

Designs the group_keys array on a billable metric, and the matching pricing_group_key / presentation_group_key on its product. Extends metronome-setup-catalog's Step 1 — read this before calling POST /v1/billable-metrics/create whenever more than one dimension is involved.

Every property referenced in group_keys, and your aggregation_key, needs a matching property_filters entry with exists: true. These are two independent checks — omitting either produces a specific, named error ("Group key '<key>' does not match one of the property filter names." for a group_keys mismatch, "The specified aggregation key must be one of the property filter names." for the aggregation_key), and you can get several of these back together in one response. property_filters is optional on the API, but in practice you'll always need one entry per dimension you group by — this is the single most common mistake when adding group keys to an existing metric.