Like Prometheus, but for logs.

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Ed Welch 67c0b3ed2c Loki: log all trace ID's but include `sampled=true` when the trace is logged (#9039) ... **What this PR does / why we need it**: Currently when we log "with context" we will only add the traceID if the particular trace is being sampled. This is nice because it makes it obvious that if you go search for a trace you'll find it. However, traceID is also useful for selecting all the log lines from a single query within Loki itself and if the trace wasn't sampled we remove this useful piece of context for querying the log lines. In this PR, instead of dropping the traceID from the logs, we instead prefix it with `NS-` Where NS is short for Not Sampled Example: ``` level=debug ts=2023-04-05T15:06:24.377067817Z caller=fetcher.go:292 org_id=145265 traceID=NS-13ed6c30228e221d chunks=1 decodeRequests=1 missing=0 ``` Questions: * should we bikeshed a little on this prefix? (I wanted something concise but if it's concise it's probably confusing to folks who've never seen it before) * Instead of a prefix, we could change the logfmt key? `ID=13ed6c30228e221d` (this is less confusing in some ways but maybe more difficult/confusing in others?) **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 - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` --------- Signed-off-by: Edward Welch <edward.welch@grafana.com>		3 years ago
..
log	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
syntax	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
vector	Refactor LogQL syntax into its own package (#5539)	4 years ago
blocker.go	Querier: block query by hash (#8953)	3 years ago
blocker_test.go	Querier: block query by hash (#8953)	3 years ago
downstream.go	Eager stream merge (#8968)	3 years ago
downstream_test.go	Max bytes read limit (#8670)	3 years ago
engine.go	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
engine_test.go	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
evaluator.go	Allow math on errors (#8823)	3 years ago
evaluator_test.go	LogQL: [optimization] syntax: Replace "panic" in "/pkg/logql/syntax" with "error" (#7208)	3 years ago
limits.go	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
mapper_metrics.go	query_frontend_shard_factor uses exponential buckets (#6689)	4 years ago
matchers.go	Refactor LogQL syntax into its own package (#5539)	4 years ago
matchers_test.go	Label selector optimizations (#8763)	3 years ago
matrix.go	Do not insert point when missing when sharding (#5444)	4 years ago
matrix_test.go	Do not insert point when missing when sharding (#5444)	4 years ago
metrics.go	Expose optional label matcher for label values handler (#8824)	3 years ago
metrics_test.go	Loki: log all trace ID's but include `sampled=true` when the trace is logged (#9039)	3 years ago
optimize.go	Add logfmt selective label extraction (#6675)	3 years ago
optimize_test.go	fix panics when cloning a special query (#8531)	3 years ago
range_vector.go	Fix min and max aggregations when using instant queries. (#7957)	3 years ago
range_vector_test.go	Fix various linter errors	3 years ago
rangemapper.go	[new feature] logql:support sort and sort_desc (#7989)	3 years ago
rangemapper_test.go	Fix various linter errors	3 years ago
shardmapper.go	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
shardmapper_test.go	Max bytes read limit (#8670)	3 years ago
step_evaluator.go	fixes a badly referenced variable name in StepEvaluator code (#3996)	5 years ago
test_utils.go	[TSDB] Use index sampling to determine shard factor (#6396)	4 years ago
vector.go	LogQL: Vector and Range Vector Aggregation.	6 years ago