I removed some code, and commented out other one.

See,
$ gometalinter --vendor --disable-all --disable=gotype --enable=megacheck --deadline 6m ./... | grep unused
pkg/api/avatar/avatar.go:100:26:warning: func (*CacheServer).mustInt is unused (U1000) (megacheck)
pkg/api/folder_test.go:136:6:warning: func callGetFolderByUID is unused (U1000) (megacheck)
pkg/api/folder_test.go:141:6:warning: func callDeleteFolder is unused (U1000) (megacheck)
pkg/api/live/hub.go:40:15:warning: func (*hub).removeConnection is unused (U1000) (megacheck)
pkg/components/imguploader/azureblobuploader.go:130:5:warning: var client is unused (U1000) (megacheck)
pkg/middleware/middleware_test.go:438:28:warning: func (*scenarioContext).withInvalidApiKey is unused (U1000) (megacheck)
pkg/services/alerting/ticker.go:40:18:warning: func (*Ticker).updateOffset is unused (U1000) (megacheck)
pkg/services/notifications/notifications_test.go:12:6:warning: type testTriggeredAlert is unused (U1000) (megacheck)
pkg/services/sqlstore/dashboard_service_integration_test.go:935:6:warning: type scenarioContext is unused (U1000) (megacheck)
pkg/services/sqlstore/dashboard_service_integration_test.go:939:6:warning: type scenarioFunc is unused (U1000) (megacheck)
pkg/services/sqlstore/dashboard_service_integration_test.go:941:6:warning: func dashboardGuardianScenario is unused (U1000) (megacheck)
pkg/services/sqlstore/transactions_test.go:13:6:warning: type testQuery is unused (U1000) (megacheck)