Error in documentation of __param_ for prometheus.scrape

[Gusser93]

What's wrong?

The documentations states:

__param__ is a prefix for labels that provide URL parameters used to scrape a target.

It seems correct would be

__param_ is a prefix for labels that provide URL parameters used to scrape a target.

Note the single _ at the end instead of two.

Steps to reproduce

Try to write a config using __param__foo, go to localhost:12345 and look at the "scraper → Debug info / target" block. There the parameter foo has an unintended leading _ resulting in _foo.

System information

Ubuntu 20.04.6 LTS x86_64 5.4.0-167-generic

Software version

Grafana Agent v0.38.1

Configuration

prometheus.scrape "foo" {
  targets = [
    {"__address__" = "localhost:123456789", "instance" = "bar", "__param__foo" = "bar"},
  ]
  forward_to = [
    prometheus.remote_write.local.receiver,
  ]
}

Logs

No response