Incorrect minimum version for Apache receiver?

[wjakelee]

Component(s)

No response

Describe the issue you're reporting

Re-opened from #34855 which was auto-closed.

Looking at the Prequisites for the Apache receiver, it claims to support version "2.4+". This implies, to me, any release in the 2.4 line.

I do not believe this is correct because some of the fields it scrapes do not appear until later versions of Apache. For example, ServerUptimeSeconds does not appear in mod_status until 2.4.13.

While this doesn't break the receiver when scraping the server-status endpoint from e.g. 2.4.6, it leads to metrics silently missing and users wondering "why some metrics are not going through".

Simple fix: update the README to say something like:

This receiver supports Apache Web Server version 2.4.13+

[github-actions]

Pinging code owners for receiver/apache: @djaglowski. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.

[ChrsMark]

I think it would be nice to clearly mention version "compatibility" in the README. However, shouldn't this be per metric?

[BeverlyJaneJ]

Pls see PR