duplicated block id: 1
size: 12 cleaned lines of code
in 2 files:
 - metrics/handler_factory_options.go (17:28)
 - metrics/http_round_tripper/factory_options.go (15:26)

duplicated block id: 2
size: 7 cleaned lines of code
in 2 files:
 - metrics/handler_factory_options.go (19:25)
 - metrics/handler_factory_options.go (30:36)

duplicated block id: 3
size: 7 cleaned lines of code
in 2 files:
 - metrics/handler_factory_options.go (30:36)
 - metrics/http_round_tripper/factory_options.go (17:23)

duplicated block id: 4
size: 6 cleaned lines of code
in 2 files:
 - mask/matchers.go (9:14)
 - mask/matchers.go (35:40)