[8.17](backport #41825) metricbeat: suppress error when RAID metrics are enabled on non-RAID system #41856
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Proposed commit message
When the Linux Metrics integration (beta) is installed with the raid metrics option enabled it causes an error if the host does not have a RAID configuration. This error causes the Agent to go into a degraded state.
This happens because we report not having
/sys/block/md*
devices as an error, this only means that no RAID configuration is in place.Instead, do not report this case as an error.
Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.Related issues
This is an automatic backport of pull request #41825 done by [Mergify](https://mergify.com).