adds matchers and metrics to regex and json

Gopkg.lock

pkg/logentry/metric/entries.go

pkg/logentry/metric/entries_test.go

pkg/logentry/pipeline.go

pkg/logentry/pipeline_test.go

pkg/logentry/stages/configs.go

pkg/logentry/stages/extensions.go

pkg/logentry/stages/json.go

pkg/logentry/stages/json_test.go

pkg/logentry/stages/match.go

pkg/logentry/stages/match_test.go

pkg/logentry/stages/metrics.go

pkg/logentry/stages/metrics_test.go

pkg/logentry/stages/mutator.go

pkg/logentry/stages/regex.go

pkg/logentry/stages/regex_test.go

pkg/logentry/stages/stage.go

pkg/logql/parser.go

pkg/promtail/promtail.go

pkg/promtail/server/server.go