Sum label values?

Monitoring and Observability Prometheus
#1

does anyone know if it’s possible to sum a label values?

app{name=“app”, num_records=“1”}
app{name=“app”, num_records=“4”}

And I want to display num_records=5

#2

try: sum (YOUR_QUERY) by (app) and sum (YOUR_QUERY) by (num_records)

#3

I did, it didn’t seems to work