fix: make the entity num metric accurate

[yah01]

fix #29642

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[codecov]

Codecov Report

Attention: 81 lines in your changes are missing coverage. Please review.

Comparison is base (3561586) 80.82% compared to head (889121d) 83.68%.
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #29643      +/-   ##
==========================================
+ Coverage   80.82%   83.68%   +2.86%     
==========================================
  Files         926      686     -240     
  Lines      127767   109175   -18592     
==========================================
- Hits       103271    91367   -11904     
+ Misses      21145    14456    -6689     
- Partials     3351     3352       +1     

Files	Coverage Δ
internal/allocator/cached_allocator.go	73.04% <100.00%> (ø)
internal/datacoord/channel_manager.go	77.61% <100.00%> (ø)
internal/datacoord/compaction_trigger.go	85.08% <100.00%> (ø)
internal/datacoord/segment_manager.go	88.04% <100.00%> (+0.50%)	⬆️
internal/datanode/event_manager.go	76.34% <100.00%> (ø)
internal/indexnode/indexnode.go	82.12% <100.00%> (ø)
internal/mq/mqimpl/rocksmq/client/client_impl.go	82.90% <100.00%> (ø)
internal/mq/mqimpl/rocksmq/client/consumer_impl.go	96.29% <100.00%> (ø)
internal/mq/mqimpl/rocksmq/server/rocksmq_impl.go	83.77% <100.00%> (+0.36%)	⬆️
...rnal/mq/mqimpl/rocksmq/server/rocksmq_retention.go	76.72% <100.00%> (ø)
... and 46 more

... and 254 files with indirect coverage changes

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[yah01]

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[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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