List every metric defined on this ad account — Atria's built-in metrics plus everything configured per-account: Meta custom conversions (fb_cc_*), Meta custom events (fb_ce_*), and Atria custom metrics (user-defined formulas). All of them are returned by default.

This is a definition catalog, not values — it tells you which metrics exist on the account and what to call them. Ids returned here are the canonical, stable way to name a metric; display names are user-editable and can collide, so prefer id.

The custom entries are account-specific and change whenever they are edited in Meta or in Atria, so re-read the catalog rather than hardcoding ids. Meta custom conversions / events exist on Facebook accounts only.

Scoped to the workspace bound to your API key. Filter with kind to fetch one family at a time — accounts can define hundreds of custom conversions.

Returns: code=0 success; code=40001 invalid account_id or workspace context missing; code=40401 when the account does not exist or belongs to a different workspace.