Like Prometheus, but for logs.

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Ashwanth d08b87f799 json parser: fix panic when processing empty line (#8835) ... **What this PR does / why we need it**: Fixes panic when an empty line is processed by `JSONExpressionParser` ``` /src/enterprise-logs/vendor/github.com/grafana/loki/pkg/logql/log/parser.go:537 github.com/grafana/loki/pkg/logql/log.isValidJSONStart(...) ... panic: runtime error: index out of range [0] with length 0 ``` **Which issue(s) this PR fixes**: Fixes #<issue number> **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [x] Tests updated - [x] `CHANGELOG.md` updated - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` --------- Signed-off-by: Ashwanth Goli <iamashwanth@gmail.com>		3 years ago
..
canary	Use 0.28.1 build image and update go and alpine versions (#8583)	3 years ago
chunkenc	Use 0.28.1 build image and update go and alpine versions (#8583)	3 years ago
configs	Update prometheus/prometheus from 2.41 to 2.42 (#8571)	3 years ago
distributor	Allow passing of context to query related limits functions (#8689)	3 years ago
ingester	Loki: Add a `prepare-shutdown` endpoint (#8786)	3 years ago
iter	Iterators: re-implement entrySortIterator using loserTree for performance (#8351)	3 years ago
logcli	Allow passing of context to query related limits functions (#8689)	3 years ago
loghttp	Loki: add a 'since' query parameter for easier querying using relative time (#7964)	3 years ago
logproto	Cosmetic lint warning fixes (#8363)	3 years ago
logql	json parser: fix panic when processing empty line (#8835)	3 years ago
logqlanalyzer	fixed logql-analyzer (#8258)	3 years ago
logqlmodel	Allow math on errors (#8823)	3 years ago
loki	Loki: Add a `prepare-shutdown` endpoint (#8786)	3 years ago
lokifrontend	Revert "Implement hierarchical queues for query scheduler" (#8796)	3 years ago
prom1/storage/metric	Copy `cortex/pkg/prom1` package dependency into Loki (#5196)	4 years ago
push	Bump golang.org/x/net from 0.4.0 to 0.7.0 in /pkg/push (#8562)	3 years ago
querier	Ruler: remote rule evaluation (#8744)	3 years ago
ruler	gofmt is needed for the build (#8678)	3 years ago
runtime	Loki/Promtail: Client Refactor (#3623)	5 years ago
scheduler	Revert "Implement hierarchical queues for query scheduler" (#8796)	3 years ago
server	Configurable TLS MinVersion and CipherSuites (#7227)	3 years ago
sizing	Add OVHcloud to sizing tool (#8423)	3 years ago
storage	chore: Fix spelling of "syncing" (#8829)	3 years ago
tracing	Promtail: Add basic tracing support (#7414)	3 years ago
usagestats	Usage stats reporter: fix to remove duplicate if block (#8392)	3 years ago
util	gofmt is needed for the build (#8678)	3 years ago
validation	Loki: Change the behavior of the 0 value for retention_period to disable retention. (#8753)	3 years ago