{
"_type": str, # message type
"_type_spec": str, # metric type
"_data_ts": float, # data timestamp
"_data": {
"measurement": str, # metric type
"tags": {
"pipeline": str,
"source": str,
"roi_name": str, # if applicable
"class_name": str, # if applicable
"lc_name": str # if applicable
},
"fields": {
"val": int/float # count or time, depending on metric
},
"time": int # time of message creation
}
}