Is there other methods or APIs to monitor qps?

[Tony Finch]

Use the statistics channel, e.g.

curl --silent http://nameserver:853/json/v1/server | jq -r .opcodes.QUERY

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Trafalgar: Northerly or northwesterly 5 to 7, decreasing 4 at times. Moderate
or rough. Rain at times. Moderate or good.