The fhir_read_ops, fhir_write_ops, and fhir_search_ops quota metrics are generally available (GA) and have replaced the legacy fhir_ops quota metric

## Feature The `fhir_read_ops`, `fhir_write_ops`, and `fhir_search_ops` quota metrics are generally available ([GA](https://cloud.google.com/products#product-launch-stages)) and have replaced the legacy `fhir_ops` quota metric. For more information, see [FHIR quotas](https://cloud.google.com/healthcare-api/quotas#fhir-quotas).