[#noissue] Add default empty string to MonitorConfig oftenUsedResources

[ga-ram]

No description provided.

[codecov]

Codecov Report

Merging #9479 (74128c1) into master (b5e84d1) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #9479   +/-   ##
=========================================
  Coverage     38.91%   38.91%           
- Complexity    11751    11754    +3     
=========================================
  Files          3446     3446           
  Lines         92297    92298    +1     
  Branches      10263    10263           
=========================================
+ Hits          35917    35922    +5     
+ Misses        53270    53268    -2     
+ Partials       3110     3108    -2     

Impacted Files	Coverage Δ
...r/context/monitor/config/DefaultMonitorConfig.java	83.33% <ø> (+0.98%)	⬆️
...p/pinpoint/rpc/stream/StreamChannelRepository.java	57.89% <0.00%> (-21.06%)	⬇️
...rc/main/java/com/navercorp/pinpoint/test/Item.java	68.51% <0.00%> (-3.71%)	⬇️
...pinpoint/profiler/monitor/DeadlockMonitorTask.java	20.45% <0.00%> (-1.14%)	⬇️
...n/server/bo/serializer/trace/v2/SpanDecoderV0.java	81.73% <0.00%> (+0.45%)	⬆️
...n/server/bo/serializer/trace/v2/SpanEncoderV0.java	83.42% <0.00%> (+0.53%)	⬆️
...ollector/cluster/zookeeper/ZookeeperJobWorker.java	79.67% <0.00%> (+1.60%)	⬆️
...om/navercorp/pinpoint/rpc/codec/PacketDecoder.java	53.33% <0.00%> (+1.66%)	⬆️
...tor/metric/datasource/DefaultDataSourceMetric.java	88.88% <0.00%> (+3.70%)	⬆️
... and 1 more

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