jsonnet: Update disk selector regex.

[AshtonKem]

Update regex used for selecting disk devices to include raid devices of the form "md123".

Description

My raid device is named "md127", which is not selected by the regexes currently used. This results in prometheus rules that would remain green even when the raid device is degraded.

This change adds "md.+" to the relevant regexes, to include these types of devices.

Type of change

What type of changes does your code introduce to the kube-prometheus? Put an x in the box that apply.

• CHANGE (fix or feature that would cause existing functionality to not work as expected)
• FEATURE (non-breaking change which adds functionality)
• BUGFIX (non-breaking change which fixes an issue)
• ENHANCEMENT (non-breaking change which improves existing functionality)
• NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Changelog entry

Please put a one-line changelog entry below. Later this will be copied to the changelog file.

Update regex used for selecting disk devices to include raid devices of the form "md123".