Here're the events.scalar_metrics payload:

{"meta":{"id":"08de8b5099dd4484a0aad19af2a140c2","trx":"08de8b5099dd4484a0aad19af2a140c2","endpoint":{"name":"events.scalar_metrics_iter_histogram","requested_version":"2.9","actual_version":"1.0"},"result_code":200,"result_subcode":0,"result_msg":"OK","error_stack":""},"data":{}}