config cleanup

[DaanHoogland]

Description

This PR tries to get rid of the Config enum or the old mechanism to define configuration items, which is long overdue. The change should be transparent, but is huge so good regression testing is required. And merg early in the release cycle is recommended.
Commits are being done in batches for review convenience. They could have been done in separate PRs but in the end the changes are rather trivial.

Fixes: #10752

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?

[codecov]

Codecov Report

❌ Patch coverage is 41.53005% with 428 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.79%. Comparing base (44ab7dd) to head (7cfb751).

Files with missing lines	Patch %	Lines
...java/com/cloud/server/ConfigurationServerImpl.java	0.00%	46 Missing ⚠️
.../cloud/resourcelimit/ResourceLimitManagerImpl.java	0.00%	31 Missing ⚠️
...oud/network/lb/ElasticLoadBalancerManagerImpl.java	5.55%	17 Missing ⚠️
.../cloud/configuration/ConfigurationManagerImpl.java	42.30%	13 Missing and 2 partials ⚠️
...ork/router/VirtualNetworkApplianceManagerImpl.java	0.00%	13 Missing ⚠️
...isor/xenserver/discoverer/XcpServerDiscoverer.java	0.00%	11 Missing ⚠️
...ava/com/cloud/network/NetworkUsageManagerImpl.java	0.00%	10 Missing ⚠️
...rc/main/java/com/cloud/usage/UsageServiceImpl.java	0.00%	10 Missing ⚠️
...oud/network/ExternalFirewallDeviceManagerImpl.java	0.00%	9 Missing ⚠️
...ain/java/com/cloud/network/NetworkServiceImpl.java	0.00%	9 Missing ⚠️
... and 100 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13884      +/-   ##
============================================
+ Coverage     19.77%   19.79%   +0.01%     
- Complexity    19989    20021      +32     
============================================
  Files          6371     6387      +16     
  Lines        575899   575880      -19     
  Branches      70495    70473      -22     
============================================
+ Hits         113912   114011      +99     
+ Misses       449563   449435     -128     
- Partials      12424    12434      +10     

Flag	Coverage Δ
uitests	3.53% <ø> (ø)
unittests	21.07% <41.53%> (+0.01%)	⬆️

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[github-actions]

🔴 Test Coverage Grade: D — Marginal

Metric	Value
Line coverage	24.69%
Branch coverage	18.92%

Grade Scale

Grade	Line Coverage	Meaning
🟢 A	≥ 80%	Excellent - this code sleeps well at night 😴
🟡 B	60-79%	Good - almost there, don't stop now 😉
🟠 C	40-59%	Acceptable - your code is wearing a seatbelt, but no airbags 😬
🔴 D	20-39%	Marginal - boldly shipping where no test has gone before 🖖
⛔ F	< 20%	Failing - tests? what tests? 🔥

Branch coverage is shown as a secondary signal. Grade is determined by line coverage.
View full Actions run

[Copilot]

🟡 Changes recommended

Several newly introduced ConfigKey defaults are inconsistent with existing schema/migration defaults (e.g., router/ELB RAM sizing), risking unintended behavior changes.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Review details

• Files reviewed: 166/166 changed files
• Comments generated: 4
• Review effort level: Lite

[Copilot]

🔵 Needs a closer look

The refactor touches a very large surface area of configuration resolution across core services and many plugins, so it warrants careful human validation and broader regression testing beyond what can be safely inferred here.

Review details

Suppressed comments (2)

Previously missed (2) — in code that hasn't changed since the last review.

server/src/test/java/com/cloud/api/response/ApiResponseSerializerTest.java:43

• This test mutates the shared ConfigKey default via reflection but does not restore it afterwards, which can leak state into other tests depending on execution order.
  server/src/test/java/com/cloud/resource/DiscovererBaseTest.java:78
• This test changes several global ConfigKey defaults via reflection but never resets them, which can make unrelated tests flaky due to shared static state.

• Files reviewed: 166/166 changed files
• Comments generated: 0 new
• Review effort level: Lite

[sonarqubecloud]

Quality Gate failed

Failed conditions
26.3% Coverage on New Code (required ≥ 40%)
C Reliability Rating on New Code (required ≥ B)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE

[DaanHoogland]

@blueorangutan package

[blueorangutan]

@DaanHoogland a [SL] Jenkins job has been kicked to build packages. It will be bundled with no SystemVM templates. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 19101

[DaanHoogland]

@blueorangutan test matrix

[blueorangutan]

@DaanHoogland a [SL] Trillian-Jenkins matrix job (ol8 mgmt + kvm-ol8, ubuntu22 mgmt + kvm-ubuntu22, ol8 mgmt + vmware-70u3, ol9 mgmt + xcpng82) has been kicked to run smoke tests