Why blackbox_exporter tcp_timeout changed to 0.5?

[leiwa...@gmail.com]

Using blackbox exporter to check the network health from specific host to many remote mysql server. Suddenly the max network delay value changed to 0.5s

Open x.x.x.x:9115 on browser and click any specific log：

Logs for the probe: ts=2020-08-31T09:05:04.80989131Z caller=main.go:304 module=tcp_connect target=192.168.116.17:3306 level=info msg="Beginning probe" probe=tcp timeout_seconds=0.5

But when i just run

curl 'http://x.x.x.x:9115/probe?module=tcp_connect&target=192.168.116.17:3306&debug=true&debug=true'

ts=2020-08-31T09:08:03.409757011Z caller=main.go:304 module=tcp_connect target=192.168.116.17:3306 level=info msg="Beginning probe" probe=tcp timeout_seconds=119.5

This really confuses me a lot.

Any insight on this?

[Brian Candler]

What's your scrape interval?  The probe timeout is automatically clipped to just under the scrape interval.

[leiwa...@gmail.com]

Thanks,  that‘s the problem.  It is because i  changed to scrape interval from 15s to 1s