Returns the values a cost control or SDK alert filter on this dimension accepts for the team. Only PROVIDER is listed: the Anthropic, Google and OpenAI vendor groups for every team, plus any other group a recorded label belongs to, each with the stored labels it covers, then every provider label the team recorded in the last 90 days. Saving an IS, IS_NOT or IN filter with a new PROVIDER value outside this list is rejected with 400.