Like Prometheus, but for logs.

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Salva Corts aae13c376d Add metadata to push payload (#9694) ... **What this PR does / why we need it**: We are adding support for attaching labels to each log line. This is one of the series of the PRs broken up to make it easier to review changes. This PR updates the push payload to send labels with each log entry optionally. The log labels are supposed to be in the same format as the stream labels. Just to put it out, here is how it would look for proto and json push payload with same data: **proto(`endpoint`: `(/loki/api/v1/push|/api/prom/push)`, `Content-Type`: `application/x-protobuf`)**(payload built using [push.Stream](4cd1246b88/pkg/push/types.go (L12))): ``` push.Stream{ Entries: []logproto.Entry{ { Timestamp: time.Unix(0, 1688515200000000000), Line: "log line", Labels: `{foo="bar"}`, }, }, Labels: `{app="test"}`, } ``` **v1(`endpoint`: `/loki/api/v1/push`, `Content-Type`: `application/json`)**: ```json { "streams": [{ "stream": { "app": "test" }, "values": [ ["1688515200000000000", "log line", { "foo": "bar" }] ] }] } ``` **legacy-json(`/api/prom/push`, `Content-Type`: `application/json`)**: ```json { "streams": [{ "labels": "{app=\"test\"}", "entries": [{ "ts": "2023-07-05T00:00:00.000000000Z", "line": "log line", "labels": "{foo=\"bar\"}" }] }] } ``` **Which issue(s) this PR fixes**: **Special notes for your reviewer**: We may need to add more thoughtful tests. **Checklist** - [x] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [x] Tests updated - [ ] `CHANGELOG.md` updated - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e3ec) --------- Co-authored-by: Sandeep Sukhani <sandeep.d.sukhani@gmail.com>		3 years ago
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client.go	Add metadata to push payload (#9694)	3 years ago