Like Prometheus, but for logs.

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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>		3 years ago
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analyzer	TOC Sync: Move LogQL and LogCLI files under Query. (#9200)	3 years ago
log_queries	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	3 years ago
_index.md	Update doc-validator to v3.0.0 (#9666)	3 years ago
analyzer.md	Update doc-validator to v3.0.0 (#9666)	3 years ago
ip.md	TOC Sync: Move LogQL and LogCLI files under Query. (#9200)	3 years ago
logcli.md	Removing 'please' from the docs. (#9658)	3 years ago
metric_queries.md	Update doc-validator to v3.0.0 (#9666)	3 years ago
query_examples.md	TOC Sync: Move LogQL and LogCLI files under Query. (#9200)	3 years ago
template_functions.md	Fix date template function with epoch times (#8886)	3 years ago