[ISSUE #5490] add metrics view & fix unit test

[ShadowySpirits]

fix #5490

[codecov-commenter]

Codecov Report

Merging #5491 (148d71f) into develop (9b2375d) will increase coverage by 0.05%.
The diff coverage is 22.03%.

@@              Coverage Diff              @@
##             develop    #5491      +/-   ##
=============================================
+ Coverage      43.18%   43.24%   +0.05%     
- Complexity      8066     8081      +15     
=============================================
  Files           1025     1025              
  Lines          72195    72232      +37     
  Branches        9559     9563       +4     
=============================================
+ Hits           31180    31236      +56     
+ Misses         37067    37044      -23     
- Partials        3948     3952       +4     

Impacted Files	Coverage Δ
...cketmq/broker/offset/ConsumerOrderInfoManager.java	76.15% <0.00%> (-1.10%)	⬇️
...va/org/apache/rocketmq/namesrv/NamesrvStartup.java	15.83% <0.00%> (ø)
...he/rocketmq/test/client/rmq/RMQNormalConsumer.java	0.00% <0.00%> (ø)
.../apache/rocketmq/test/client/rmq/RMQPopClient.java	0.00% <0.00%> (ø)
...pache/rocketmq/test/client/rmq/RMQPopConsumer.java	0.00% <0.00%> (ø)
.../apache/rocketmq/test/factory/ConsumerFactory.java	0.00% <0.00%> (ø)
...rg/apache/rocketmq/test/util/MQAdminTestUtils.java	0.00% <ø> (ø)
...org/apache/rocketmq/tools/command/CommandUtil.java	31.16% <0.00%> (-3.12%)	⬇️
...rocketmq/broker/processor/PopMessageProcessor.java	37.39% <52.63%> (+0.08%)	⬆️
...cketmq/broker/schedule/ScheduleMessageService.java	58.04% <100.00%> (ø)
... and 21 more

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