How to fetch metafields from multiple namespaces

When querying metafields, a namespace and set of keys are required.  To request metafields from different namespaces, you can use GraphQL aliases. For example:

 query metafieldsTest {
  site {
    product(entityId: 103) {
      entityId
      name
      space48Metafields: metafields(
        namespace: "space48"
        keys: ["test_one"]
      ) {
        edges {
          node {
            key
            value
          }
        }
      },
      othernamespaceMetafields: metafields(
        namespace: "other_namespace"
        keys: ["test_two"]
      ) {
          edges {
            node {
              key
              value
          }
        }
      }
    }
  }
}