fix the error of writing metrics

[HTHou]

Description

The current code contains the following metrics errors, this PR is for fixing them.

2024-01-04 14:27:40,447 [pool-9-IoTDB-StorageEngine-2] ERROR o.a.i.m.utils.MetricInfo:52 - The size of metric tags should be even, but was name,region,2.
2024-01-04 14:27:40,447 [pool-9-IoTDB-StorageEngine-1] ERROR o.a.i.m.utils.MetricInfo:52 - The size of metric tags should be even, but was name,region,1.

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[OneSizeFitsQuorum]

LGTM

[codecov-commenter]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (7595a1a) 49.01% compared to head (15dd767) 49.02%.
Report is 4 commits behind head on master.

Files	Patch %	Lines
.../db/storageengine/dataregion/wal/node/WALNode.java	83.92%	9 Missing ⚠️
...pache/iotdb/db/service/metrics/WritingMetrics.java	0.00%	4 Missing ⚠️
...e/dataregion/memtable/AlignedWritableMemChunk.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #11846   +/-   ##
=========================================
  Coverage     49.01%   49.02%           
+ Complexity    25586    25583    -3     
=========================================
  Files          2907     2907           
  Lines        181077   181077           
  Branches      21670    21669    -1     
=========================================
+ Hits          88754    88769   +15     
+ Misses        92323    92308   -15     

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[SpriCoder]

LGTM~