constructing the expiry Prometheus Item according to new format

[DaanHoogland]

Description

This PR fixes a merge forwards problem...

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[Copilot]

Pull request overview

Updates the Prometheus exporter’s host certificate expiry metric to follow the newer Item metadata format (name/help/type), addressing a merge-forward incompatibility with the current Item base class constructor.

Changes:

• Update ItemHostCertExpiry to call the 3-argument Item constructor with metric name, help text, and type.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.92%. Comparing base (a7dc5ef) to head (f1ffceb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##              main   #12653       +/-   ##
============================================
+ Coverage     3.67%   17.92%   +14.25%     
- Complexity       0    16154    +16154     
============================================
  Files          454     5939     +5485     
  Lines        38539   533151   +494612     
  Branches      7125    65228    +58103     
============================================
+ Hits          1415    95589    +94174     
- Misses       36937   426823   +389886     
- Partials       187    10739    +10552     

Flag	Coverage Δ
uitests	3.67% <ø> (ø)
unittests	19.03% <100.00%> (?)

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[weizhouapache]

code lgtm

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Maintainability Rating on New Code (required ≥ B)

See analysis details on SonarQube Cloud

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