Feature Request: Configurable Max Number of Concurrent Queries

[joesixpack]

The hardcoded limit of 1024 is simply not enough.

Dec 11 01:32:27 graph dockerd[775]: time="2020-12-11T01:32:27.313894086-08:00" level=error msg="[resolver] more than 1024 concurrent queries from 172.21.0.10:35758"

Dec 11 01:32:32 graph dockerd[775]: time="2020-12-11T01:32:32.376307265-08:00" level=error msg="[resolver] more than 1024 concurrent queries from 172.21.0.10:40694"

Previous fix: #2214

[siju-vasudevan]

We are also facing this issue. Basically i have more than 8k host which is getting scraped by blackbox expoter(icmp) and once in a while we are hitting this issue. When such issue happens it is creating false alerts since blackbox exporter is not able to resolve the dns of target and metrics will be populated with zero value. It will be great if you can fix this issue ASAP or make the value to be configurable.