allegro / marathon-consul / 1082

91%

Pull #250

travis-ci

Calculate common tags only once.

This PR extracts commonTags outside of loop.
They are not changed inside the loop so there is no
need to recalculate them every time.
Ta reduce allocations tags slice i create with
initial capacity equal to the lenght of application labels.

```
benchmark                              old ns/op     new ns/op     delta
BenchmarkApp_RegistrationIntents-8     438           415           -5.25%
BenchmarkApp_RegistrationIntents-8     436           419           -3.90%
BenchmarkApp_RegistrationIntents-8     432           415           -3.94%

benchmark                              old allocs     new allocs     delta
BenchmarkApp_RegistrationIntents-8     4              3              -25.00%
BenchmarkApp_RegistrationIntents-8     4              3              -25.00%
BenchmarkApp_RegistrationIntents-8     4              3              -25.00%

benchmark                              old bytes     new bytes     delta
BenchmarkApp_RegistrationIntents-8     128           208           +62.50%
BenchmarkApp_RegistrationIntents-8     128           208           +62.50%
BenchmarkApp_RegistrationIntents-8     128           208           +62.50%
```

4 of 4 new or added lines in 1 file covered. (100.0%)

1699 of 1901 relevant lines covered (89.37%)

17.98 hits per line