fix: LB Creation avoid 404 API errors due to non-needed patches

[ZhyliaievD]

Description

• Avoid unnecessary NSX load balancer patch calls when the target resource already exists and does not need updating.
• Reuse existing LB active monitor profiles instead of patching them again, which prevents avoidable 404 API errors during LB creation.
• Skip server pool patching when the current NSX pool already has the same members, and skip virtual server patching when the virtual server already exists.
• Fix createAndAddNsxLbVirtualServer() to check for an existing virtual server using the virtual server name, so existing virtual servers are detected correctly and not patched again

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

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

This PR optimizes NSX load balancer creation by avoiding unnecessary API PATCH calls when resources already exist and don't need updating. It fixes a bug where createAndAddNsxLbVirtualServer() was checking for an existing virtual server using the wrong name (the LB service name instead of the virtual server name), causing it to never detect existing virtual servers.

Changes:

• Skip monitor profile patching when the profile already exists in NSX, and skip server pool patching when the pool already has the same members
• Fix the virtual server existence check to use the correct virtual server name instead of the LB service name, so existing virtual servers are detected and not re-patched
• Add comprehensive unit tests covering all the new skip/patch scenarios

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
plugins/network-elements/nsx/src/main/java/org/apache/cloudstack/service/NsxApiClient.java	Add existence checks for monitor profiles, server pools, and virtual servers to avoid unnecessary NSX API patch calls; fix virtual server lookup to use correct name
plugins/network-elements/nsx/src/test/java/org/apache/cloudstack/service/NsxApiClientTest.java	Add tests for monitor profile reuse, pool member comparison skip/patch logic, and virtual server existence detection

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[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 18.05%. Comparing base (b744824) to head (4ea0f3d).

Files with missing lines	Patch %	Lines
...va/org/apache/cloudstack/service/NsxApiClient.java	95.83%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12835      +/-   ##
============================================
+ Coverage     18.02%   18.05%   +0.02%     
- Complexity    16450    16477      +27     
============================================
  Files          5968     5968              
  Lines        537086   537119      +33     
  Branches      65961    65963       +2     
============================================
+ Hits          96819    96978     +159     
+ Misses       429347   429214     -133     
- Partials      10920    10927       +7     

Flag	Coverage Δ
uitests	3.53% <ø> (ø)
unittests	19.22% <95.83%> (+0.03%)	⬆️

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[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.

[Copilot]

Pull request overview

This PR avoids unnecessary NSX API patch calls during load balancer creation by checking if resources already exist before patching, preventing 404 errors.

Changes:

• Skip server pool patching when existing pool has identical members; skip virtual server patching when it already exists.
• Reuse existing LB active monitor profiles instead of re-patching them, fetching by ID directly rather than listing all profiles.
• Fix createAndAddNsxLbVirtualServer() to look up the virtual server by its own name instead of the LB service name.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
NsxApiClient.java	Added existence checks for pools, monitor profiles, and virtual servers before issuing patch calls; fixed virtual server lookup key.
NsxApiClientTest.java	Added tests covering skip/patch scenarios for server pools, monitor profiles, virtual servers, and error handling.

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 17174