Intent of metricstest.go ×4

All 3 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 3 tests
- server/ 3 tests
  - common/ 2 tests
    
    metrics/ 2 tests
    
    metricstest/ 2 tests
    
    TestHandler/ 2 tests
    
    go.temporal.io/server/common/metrics/metricstest/TestHandler/counter Inherited counter
    
    go.temporal.io/server/common/metrics/metricstest/TestHandler/gauge Inherited metricstest.go ×1
  - service/ 1 test
    
    history/ 1 test
    
    shard/ 1 test
    
    TestShardControllerSuite/ 1 test
    
    go.temporal.io/server/service/history/shard/TestShardControllerSuite/TestShardLingerTimeout Inherited controller_impl.go ×1