Like Prometheus, but for logs.

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Sandeep Sukhani 0e5da205a6 structured metadata: track usage of structured metadata in queries (#11505) ... **What this PR does / why we need it**: Adds support for tracking queries referencing structured metadata. It tracks the following kinds of references: * Fields in structured metadata used as label filters, `drop`/`keep` stages etc. in the query. * Fields in structured metadata used in metric queries like `uwrap` and `by` or `without` clauses in aggregations. **Checklist** - [x] Tests updated		1 year ago
..
jsonexpr	JSON label extraction field validation expression overly strict (#6372)	3 years ago
logfmt	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
pattern	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
drop_labels.go	Upgrade `golangci-lint` and fix linting errors (#9601)	2 years ago
drop_labels_test.go	Add keep stage to LogQL (#9693)	2 years ago
error.go	Loki/Promtail: Client Refactor (#3623)	4 years ago
filter.go	Implement "or" statement in line filters (#8962)	2 years ago
filter_test.go	Implement "or" statement in line filters (#8962)	2 years ago
fmt.go	reduce cost of pipeline stages by pooling maps we create for labels (#11484)	1 year ago
fmt_test.go	Add handling of timezones in unixToTime tests (#9707)	2 years ago
ip.go	Serialize query AST to JSON. (#11123)	2 years ago
ip_test.go	logql/log tests: use abstractions over labels (#9532)	2 years ago
keep_labels.go	Add keep stage to LogQL (#9693)	2 years ago
keep_labels_test.go	Add keep stage to LogQL (#9693)	2 years ago
label_extraction_expr.go	chore: Cleanup label extraction expression (#8596)	2 years ago
label_filter.go	Clone filterer of label filter (#11514)	1 year ago
label_filter_test.go	logql/log tests: use abstractions over labels (#9532)	2 years ago
labels.go	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
labels_test.go	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
metrics_extraction.go	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
metrics_extraction_test.go	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
parser.go	Flag categorize labels on streams response (#10419)	2 years ago
parser_hints.go	logfmt: add --strict flag to enable strict parsing, perform nostrict parsing by default (#9626)	2 years ago
parser_hints_test.go	logql/log tests: use abstractions over labels (#9532)	2 years ago
parser_test.go	Flag categorize labels on streams response (#10419)	2 years ago
pipeline.go	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
pipeline_test.go	structured metadata: track usage of structured metadata in queries (#11505)	1 year ago
util.go	Improve the JSON parser performance. (#7723)	2 years ago
util_test.go	Fixes bad initialization for uniqueString (#6432)	3 years ago