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
..
canary	Loki Canary: Enable insecure-skip-verify for all requests (#8869)	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	Loki: Improve spans usage (#8927)	3 years ago
ingester	Loki: Improve spans usage (#8927)	3 years ago
iter	Iterators: re-implement mergeEntryIterator using loser.Tree for performance (#8637)	3 years ago
logcli	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago
loghttp	Expose optional label matcher for label values handler (#8824)	3 years ago
logproto	Expose optional label matcher for label values handler (#8824)	3 years ago
logql	Loki: log all trace ID's but include `sampled=true` when the trace is logged (#9039)	3 years ago
logqlanalyzer	fixed logql-analyzer (#8258)	3 years ago
logqlmodel	Eager stream merge (#8968)	3 years ago
loki	chore(format_query): Change response type to `application/json` (#9016)	3 years ago
lokifrontend	Extend scheduler queue metrics with enqueue/dequeue counters (#8891)	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	Fail through to next middleware when querySizeLimit cannot be applied (#9050)	3 years ago
ruler	feat(storage): add support for IBM cloud object storage as storage client (#8826)	3 years ago
runtime	…
scheduler	Enforce per tenant queue size (#8947)	3 years ago
server	Configurable TLS MinVersion and CipherSuites (#7227)	3 years ago
sizing	Add OVHcloud to sizing tool (#8423)	3 years ago
storage	makes test pass for 0 sharding factor (equivalent to no sharding) (#9065)	3 years ago
tracing	Promtail: Add basic tracing support (#7414)	3 years ago
usagestats	Loki: Add UsageStatsURL to usagestats Config (#8779)	3 years ago
util	Loki: log all trace ID's but include `sampled=true` when the trace is logged (#9039)	3 years ago
validation	Loki: Add a limit for the [range] value on range queries (#8343)	3 years ago