Fixes #6621 - Update host memory stats

[Rubueno]

Description

This PR ensures that when getMemStat() is called in KVM environments, the hosts actual used memory is returned, and not a static value that was retrieved when the cloudstack-agent was started.

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)
• [x] Enhancement (improves an existing feature and functionality)
• [ ] Cleanup (Code refactoring and cleanup, that may add test cases)

Feature/Enhancement Scale

Feature/Enhancement Scale

• [ ] Major
• [x] Minor

Screenshots (if appropriate):

How Has This Been Tested?

We have applied this patch into our own environment, built the packages and installed them on the managers and hosts. We then migrated VMs between hosts and saw the host memory usage being updated, instead of remaining static until the cloudstack-agent was restarted.

[acs-robot]

Found UI changes, kicking a new UI QA build @blueorangutan ui

[blueorangutan]

@acs-robot a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: :heavy_check_mark: Live QA URL: http://qa.cloudstack.cloud:8080/client/pr/6622 (SL-JID-2118)

[rohityadavcloud]

@Rubueno can you change the base branch of this PR to 4.17 and rebase your PR branch on 4.17?

[acs-robot]

Found UI changes, kicking a new UI QA build @blueorangutan ui

[Rubueno]

component:networking was added by mistake

[acs-robot]

Found UI changes, kicking a new UI QA build @blueorangutan ui

[blueorangutan]

@acs-robot a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[acs-robot]

Found UI changes, kicking a new UI QA build @blueorangutan ui

[blueorangutan]

@acs-robot a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[Rubueno]

@Rubueno can you change the base branch of this PR to 4.17 and rebase your PR branch on 4.17?

Done as requested. Please let me know if there's something missing or done incorrect.

[blueorangutan]

UI build: :heavy_check_mark: Live QA URL: http://qa.cloudstack.cloud:8080/client/pr/6622 (SL-JID-2119)

[blueorangutan]

UI build: :heavy_check_mark: Live QA URL: http://qa.cloudstack.cloud:8080/client/pr/6622 (SL-JID-2120)

[codecov-commenter]

Codecov Report

Merging #6622 (f12cdc6) into 4.17 (6842583) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               4.17    #6622      +/-   ##
============================================
- Coverage      5.86%    5.86%   -0.01%     
  Complexity     3918     3918              
============================================
  Files          2451     2451              
  Lines        242238   242239       +1     
  Branches      37902    37902              
============================================
  Hits          14207    14207              
- Misses       226461   226462       +1     
  Partials       1570     1570              

Impacted Files	Coverage Δ
...ervisor/kvm/resource/LibvirtComputingResource.java	16.00% <0.00%> (-0.01%)	:arrow_down:

:mega: Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[rohityadavcloud]

@blueorangutan package

[blueorangutan]

@rohityadavcloud a 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.

[blueorangutan]

Packaging result: :heavy_check_mark: el7 :heavy_check_mark: el8 :heavy_check_mark: debian :heavy_check_mark: suse15. SL-JID 3954

[Rubueno]

Rebased onto a missing commit. Please restart required workflows.

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[rohityadavcloud]

@blueorangutan package

[blueorangutan]

@rohityadavcloud a 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.

[blueorangutan]

Packaging result: :heavy_check_mark: el7 :heavy_check_mark: el8 :heavy_check_mark: debian :heavy_check_mark: suse15. SL-JID 3957

[shwstppr]

@blueorangutan test

[blueorangutan]

@shwstppr a Trillian-Jenkins test job (centos7 mgmt + kvm-centos7) has been kicked to run smoke tests

[blueorangutan]

Trillian test result (tid-4670) Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7 Total time taken: 39656 seconds Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr6622-t4670-kvm-centos7.zip Smoke tests completed. 100 look OK, 1 have errors Only failed tests results shown below:

Test	Result	Time (s)	Test File
test_08_upgrade_kubernetes_ha_cluster	Failure	572.22	test_kubernetes_clusters.py