Like Prometheus, but for logs.

prometheushacktoberfestgrafanacloudnativeloggingloki

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Owen Diehl eaa0919e53 Use labelbuilder in syntax.ParseLabels to remove empty label values (#7355) ... There's a bug in TSDB where empty label values alter the series fingerprints used in chunk addresses, but are stripped out and create different fingerprints in our TSDB based index. I plan to open a PR to Prometheus, but I also prefer normalizing labels here by removing empty label values. According to [Prometheus](https://prometheus.io/docs/concepts/data_model/), > A label with an empty label value is considered equivalent to a label that does not exist. Our bug comes from the Prometheus model `LabelBuilder` stripping out empty label values, [here](https://github.com/grafana/loki/blob/main/vendor/github.com/prometheus/prometheus/model/labels/labels.go#L419-L423). This means that `Labels.NewBuilder({job="foo",bar=""}) => {job="foo"}`. The [labels.Hash()](https://github.com/grafana/loki/blob/main/vendor/github.com/prometheus/prometheus/model/labels/labels.go#L136-L182) function does not skip empty label values, meaning it's easy to end up with different fingerprints for effectively the same series (an empty label value is supposed to be equivalent to a missing label in prometheus, but they generate different label hashes).		3 years ago
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ast.go	[new feature] syntax: support "vector" grama (#7007)	3 years ago
ast_test.go	[new feature] logql engine support exec `vector(0)` grama (#7023)	3 years ago
expr.y	[new feature] syntax: support "vector" grama (#7007)	3 years ago
expr.y.go	[new feature] syntax: support "vector" grama (#7007)	3 years ago
extractor.go	…
extractor_test.go	…
fuzz.go	Build: update package for fuzzer after refactoring (#5776)	4 years ago
fuzz_test.go	Replace deprecated `io/ioutil` with `io` and `os` packages (#7212)	3 years ago
lex.go	[new feature] syntax: support "vector" grama (#7007)	3 years ago
lex_test.go	Add unwrapped aggregation `rate_counter()` (#6412)	4 years ago
parser.go	Use labelbuilder in syntax.ParseLabels to remove empty label values (#7355)	3 years ago
parser_test.go	Use labelbuilder in syntax.ParseLabels to remove empty label values (#7355)	3 years ago
walk.go	…
walk_test.go	…