Fix MethodKeyRt override & Error enhance

[AlbumenJ]

What is the purpose of the change

• Fix java.lang.ArithmeticException
• Error enhance when calc metrics

Brief changelog

 THROW-EXCEPTION  java.lang.ArithmeticException: / by zero
                    at org.apache.dubbo.metrics.data.RtStatComposite.lambda$initStats$19(RtStatComposite.java:90)
                    at org.apache.dubbo.metrics.data.RtStatComposite.lambda$export$20(RtStatComposite.java:204)
                    at io.micrometer.core.instrument.internal.DefaultGauge.value(DefaultGauge.java:40)
                    at io.micrometer.prometheus.PrometheusMeterRegistry.lambda$newGauge$3(PrometheusMeterRegistry.java:230)
                    at io.micrometer.prometheus.MicrometerCollector.lambda$collect$0(MicrometerCollector.java:81)

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
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[AlbumenJ]

@songxiaosheng PTAL

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1368e21) 70.40% compared to head (f80d2d0) 70.37%.
Report is 1 commits behind head on 3.2.

Additional details and impacted files

@@            Coverage Diff             @@
##              3.2   #13580      +/-   ##
==========================================
- Coverage   70.40%   70.37%   -0.03%     
==========================================
  Files        1605     1605              
  Lines       69964    69972       +8     
  Branches    10092    10095       +3     
==========================================
- Hits        49255    49246       -9     
- Misses      16075    16096      +21     
+ Partials     4634     4630       -4     

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[AlbumenJ]

Integration test cases apache/dubbo-integration-cases#4

[songxiaosheng]

LGTM

[sonarcloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

1 New issue
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud