fix: [2.5]fix rootcoord_entity_num metric bug

[presburger]

#45579

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[INFO] PR Label Summary by Default [WARNING] No dependent PR reference found

• Target branch '2.5' requires a PR merged to master first
• Please add reference in format 'pr: #number'

[WARNING] Milestone not set

• PR: #45578
• Title: fix: fix rootcoord_entity_num metric bug Please set a milestone for better release tracking

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 82.06%. Comparing base (3a7a08f) to head (0670d55). :warning: Report is 77 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #45578      +/-   ##
==========================================
- Coverage   82.10%   82.06%   -0.05%     
==========================================
  Files        1128     1587     +459     
  Lines      179181   248695   +69514     
==========================================
+ Hits       147110   204080   +56970     
- Misses      26099    38608   +12509     
- Partials     5972     6007      +35     

Components	Coverage Δ
Client	78.90% <22.22%> (-0.06%)	:arrow_down:
Core	84.56% <79.54%> (∅)
Go	82.38% <78.18%> (+<0.01%)	:arrow_up:

Files with missing lines	Coverage Δ
internal/rootcoord/meta_table.go	82.63% <100.00%> (+0.04%)	:arrow_up:
internal/rootcoord/quota_center.go	83.56% <100.00%> (+0.56%)	:arrow_up:
pkg/metrics/rootcoord_metrics.go	100.00% <ø> (ø)

... and 511 files with indirect coverage changes

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[sre-ci-robot]

[ci-v2-notice] Notice: We are gradually rolling out the new ci-v2 system.

• Legacy CI jobs remain unaffected, you can just ignore ci-v2 if you don't want to run it.
• Additional "ci-v2/*" checkers will run for this PR to ensure the new ci-v2 system is working as expected.
• For tests that exist in both v1 and v2, passing in either system is considered PASS.

To rerun ci-v2 checks, comment with:

• /ci-rerun-code-check // for ci-v2/code-check
• /ci-rerun-build // for ci-v2/build
• /ci-rerun-ut-integration // for ci-v2/ut-integration
• /ci-rerun-ut-go // for ci-v2/ut-go
• /ci-rerun-ut-cpp // for ci-v2/ut-cpp
• /ci-rerun-ut // for all ci-v2/ut-integration, ci-v2/ut-go, ci-v2/ut-cpp
• /ci-rerun-e2e-arm // for ci-v2/e2e-arm

If you have any questions or requests, please contact @zhikunyao.

[sre-ci-robot]

[INFO] PR Label Summary by Default [WARNING] No dependent PR reference found

• Target branch '2.5' requires a PR merged to master first
• Please add reference in format 'pr: #number'

[WARNING] Milestone not set

• PR: #45578
• Title: fix: fix rootcoord_entity_num metric bug Please set a milestone for better release tracking

You can set milestone by commenting: /set-milestone Example: /set-milestone 2.5.0

Use /refresh-label to update related check and label manually