async fn retrieve_metric_metadata(
query_ctx: &QueryContext,
manager: CatalogManagerRef,
params: &MetadataQuery,
) -> Result<BTreeMap<String, Vec<PromMetadata>>>async fn retrieve_metric_metadata(
query_ctx: &QueryContext,
manager: CatalogManagerRef,
params: &MetadataQuery,
) -> Result<BTreeMap<String, Vec<PromMetadata>>>