Like Prometheus, but for logs.

prometheushacktoberfestgrafanacloudnativeloggingloki

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Ashwanth f9fc1df4c0 logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626) ... **What this PR does / why we need it**: Introduces `--strict` flag for logfmt parser to enable strict parsing. With strict parsing enabled, logfmt parser stops scanning the log line and returns early with an error if it encounters any poorly formatted key=value pair. This pr updates the parser to perform non-strict parsing by default where it skips over the invalid tokens. This offers the flexibility to parse semi-structured log lines. Also adds `--keep-empty` flag to retain standalone keys(with empty value) as labels with value set to empty string **Special notes for your reviewer**: **Checklist** - [X] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [X] Documentation added - [X] Tests updated - [x] `CHANGELOG.md` updated - [x] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` --------- Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>		2 years ago
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ast.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
ast_test.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
expr.y	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
expr.y.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
extractor.go	LogQL: [optimization] syntax: Replace "panic" in "/pkg/logql/syntax" with "error" (#7208)	2 years ago
extractor_test.go	Refactor LogQL syntax into its own package (#5539)	3 years ago
fuzz.go	Build: update package for fuzzer after refactoring (#5776)	3 years ago
fuzz_test.go	Replace deprecated `io/ioutil` with `io` and `os` packages (#7212)	3 years ago
lex.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
lex_test.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
parser.go	Update Prometheus dependency (#9205)	2 years ago
parser_test.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
prettier.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
prettier_test.go	feat(logql): Supporting prettifying LogQL expressions (#7906)	2 years ago
query_scanner.go	Fix parsing of long queries (#9134)	2 years ago
walk.go	Refactor LogQL syntax into its own package (#5539)	3 years ago
walk_test.go	fix panics when cloning a special query (#8531)	2 years ago