Remove the duplicate configkey json.content.type

[sureshanaparti]

Description

This PR removes the duplicate configkey json.content.type. Preserved the same description for the config as now in the CloudStack deployment.

The config key was added twice here: https://github.com/apache/cloudstack/pull/2848/files#diff-d4f381fc49d5bb07c76daf73677484cace911ff56eb08e60b253b6ef0273124d (in 4.12.0.0) and one config key is unused.

mysql> SELECT * FROM cloud.configuration WHERE name = 'json.content.type'\G;
*************************** 1. row ***************************
     category: Advanced
     instance: DEFAULT
    component: ApiServer
         name: json.content.type
        value: application/json; charset=UTF-8
  description: Http response content type for JSON
default_value: application/json; charset=UTF-8
      updated: 2026-05-06 15:55:35
   is_dynamic: 0
     group_id: 1
  subgroup_id: 1
       parent: NULL
 display_text: Json content type
         kind: NULL
      options: NULL
        scope: 1
1 row in set (0.01 sec)

mysql> SELECT * FROM cloud.configuration WHERE description LIKE '%Http response content%'\G;
*************************** 1. row ***************************
     category: Advanced
     instance: DEFAULT
    component: ApiServer
         name: json.content.type
        value: application/json; charset=UTF-8
  description: Http response content type for JSON
default_value: application/json; charset=UTF-8
      updated: 2026-05-06 15:55:35
   is_dynamic: 0
     group_id: 1
  subgroup_id: 1
       parent: NULL
 display_text: Json content type
         kind: NULL
      options: NULL
        scope: 1
1 row in set (0.01 sec)

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?

[sureshanaparti]

@blueorangutan package

[blueorangutan]

@sureshanaparti a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.26%. Comparing base (c267ad3) to head (2cd1368).
⚠️ Report is 3 commits behind head on 4.20.

Files with missing lines	Patch %	Lines
server/src/main/java/com/cloud/api/ApiServlet.java	40.00%	5 Missing and 1 partial ⚠️
server/src/main/java/com/cloud/api/ApiServer.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.20   #13264      +/-   ##
============================================
- Coverage     16.26%   16.26%   -0.01%     
+ Complexity    13433    13432       -1     
============================================
  Files          5665     5666       +1     
  Lines        500572   500626      +54     
  Branches      60792    60796       +4     
============================================
+ Hits          81417    81425       +8     
- Misses       410047   410092      +45     
- Partials       9108     9109       +1     

Flag	Coverage Δ
uitests	4.14% <ø> (-0.01%)	⬇️
unittests	17.12% <41.66%> (+<0.01%)	⬆️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 18061

[DaanHoogland]

clgtm

[winterhazel]

@sureshanaparti it seems that we're missing the JSONContentType ConfigKey in a getConfigKeys() method. Could you add it here?