[#4132] router support set fallback route as downgrading routing strategy

[chengyouling]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 849 lines in your changes are missing coverage. Please review.

Comparison is base (ec57988) 43.88% compared to head (96d35d0) 44.32%.
Report is 73 commits behind head on master.

❗ Current head 96d35d0 differs from pull request most recent head c6e3121. Consider uploading reports for the commit c6e3121 to get more accurate results

Files	Patch %	Lines
...huaweicloud/servicestage/RBACBootStrapService.java	0.00%	104 Missing ⚠️
...mb/huaweicloud/servicestage/TokenCacheManager.java	0.00%	69 Missing ⚠️
...comb/metrics/core/publish/DefaultLogPublisher.java	3.22%	60 Missing ⚠️
...cecomb/metrics/core/meter/vertx/EndpointMeter.java	0.00%	53 Missing ⚠️
...omb/metrics/core/publish/SlowInvocationLogger.java	35.52%	49 Missing ⚠️
...re/meter/ThreadPoolMonitorPublishModelFactory.java	0.00%	30 Missing ⚠️
...ervicecomb/config/kie/client/KieConfigManager.java	0.00%	26 Missing ⚠️
...b/router/distribute/AbstractRouterDistributor.java	0.00%	26 Missing ⚠️
...vicecomb/core/filter/impl/ContextMapperFilter.java	20.00%	20 Missing ⚠️
...core/meter/invocation/ProducerInvocationMeter.java	0.00%	20 Missing ⚠️
... and 80 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4134      +/-   ##
============================================
+ Coverage     43.88%   44.32%   +0.43%     
- Complexity     5378     5381       +3     
============================================
  Files          1389     1382       -7     
  Lines         34383    34285      -98     
  Branches       3351     3320      -31     
============================================
+ Hits          15089    15196     +107     
+ Misses        18064    17858     -206     
- Partials       1230     1231       +1     

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