mongo v3.2.10
telegraf 1.19

I choose telegraf+prom+grafana to build my montior
I want to collect topstats of collections
when I check top_stat I found unexcepted output
1、one collection with node_type="PRI" but hostname was cfgsrv ip ,not the primary ip
2、cfgsrv has three rs ,so the output also become three
however my telegraf config do not include cfgsrv ips

I learn that the data is from {top:1} but how do it compare its hostname