Merge branch 'master' of https://github.com/grafana/loki into live-log-tailing-improvements

README.md

cmd/promtail/main.go

docs/promtail-examples.md

docs/promtail-setup.md

docs/promtail.md

docs/troubleshooting.md

pkg/ingester/flush.go

pkg/logentry/pipeline.go

pkg/logentry/pipeline_test.go

pkg/logentry/stages/extensions.go

pkg/logentry/stages/extensions_test.go

pkg/logentry/stages/json.go

pkg/logentry/stages/json_test.go

pkg/logentry/stages/regex.go

pkg/logentry/stages/regex_test.go

pkg/logentry/stages/stage.go

pkg/logentry/stages/util.go

pkg/logentry/stages/util_test.go

pkg/promtail/scrape/scrape.go

pkg/promtail/scrape/scrape_test.go