Like Prometheus, but for logs.

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Raul Gonzales 7d5475541c promtail: enable structured_metadata convert labels (#10752) ... **What this PR does / why we need it**: There are several labels that can be extracted by the supports service discovery providers, however the structured metadata wouldn't allow to parse labels to it. This PR allows the users to update the configuration to read from labels discovered, down below are some of the metadata from a pod, that could be of interested of anyone to have that pushed to Loki without creating several streams due to either high-carnality or proliferation of idle chunks: ``` __address__="10.0.165.166:3100" __meta_kubernetes_namespace="loki" __meta_kubernetes_pod_annotation_checksum_config="f008ef39c4f3230c5e153c6e9fde51a678e6f0b1087b3be7d91b8142a03dbe7c" __meta_kubernetes_pod_annotation_kubectl_kubernetes_io_default_container="loki" __meta_kubernetes_pod_annotationpresent_checksum_config="true" __meta_kubernetes_pod_annotationpresent_kubectl_kubernetes_io_default_container="true" __meta_kubernetes_pod_container_id="containerd://e6aef5c39c3fe806d39ea536b198c8c39cdee01d23141fed91e8fe1573cc5e08" __meta_kubernetes_pod_container_image="docker.io/grafana/loki:2.9.1" __meta_kubernetes_pod_container_init="false" __meta_kubernetes_pod_container_name="loki" __meta_kubernetes_pod_container_port_name="http-metrics" __meta_kubernetes_pod_container_port_number="3100" __meta_kubernetes_pod_container_port_protocol="TCP" __meta_kubernetes_pod_controller_kind="StatefulSet" __meta_kubernetes_pod_controller_name="loki-write" __meta_kubernetes_pod_host_ip="10.249.129.191" __meta_kubernetes_pod_ip="10.0.165.166" __meta_kubernetes_pod_label_app_kubernetes_io_component="write" __meta_kubernetes_pod_label_app_kubernetes_io_instance="loki" __meta_kubernetes_pod_label_app_kubernetes_io_name="loki" __meta_kubernetes_pod_label_app_kubernetes_io_part_of="memberlist" __meta_kubernetes_pod_label_controller_revision_hash="loki-write-75847dc945" __meta_kubernetes_pod_label_statefulset_kubernetes_io_pod_name="loki-write-1" __meta_kubernetes_pod_labelpresent_app_kubernetes_io_component="true" __meta_kubernetes_pod_labelpresent_app_kubernetes_io_instance="true" __meta_kubernetes_pod_labelpresent_app_kubernetes_io_name="true" __meta_kubernetes_pod_labelpresent_app_kubernetes_io_part_of="true" __meta_kubernetes_pod_labelpresent_controller_revision_hash="true" __meta_kubernetes_pod_labelpresent_statefulset_kubernetes_io_pod_name="true" __meta_kubernetes_pod_name="loki-write-1" __meta_kubernetes_pod_node_name="ip-10-249-129-191.ec2.internal" __meta_kubernetes_pod_phase="Running" __meta_kubernetes_pod_ready="false" __meta_kubernetes_pod_uid="b3937321-fe90-4e15-ac94-495c8fdb9202" ``` **Which issue(s) this PR fixes**: https://github.com/grafana/loki/issues/10766 **Special notes for your reviewer**: **Checklist** - [x] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [x] Documentation added - [x] Tests updated - [x] `CHANGELOG.md` updated - [x] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_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: J Stickler <julie.stickler@grafana.com>		2 years ago
..
cloud	[Docs] Separate command and result (#10463)	2 years ago
logrotation	[docs] Create top level Send data section, part 2 (#10247)	2 years ago
stages	promtail: enable structured_metadata convert labels (#10752)	2 years ago
troubleshooting	[docs] Create top level Send data section, part 2 (#10247)	2 years ago
_index.md	docs: fix promtail configuration sample for compressed files (#10784)	2 years ago
configuration.md	Restructure API reference documentation (#10654)	2 years ago
installation.md	chore: Missed version updates. (#10676)	2 years ago
pipelines.md	Add docs for non-indexed labels (#10073)	2 years ago
scraping.md	Docs: Remove experimental flag from GELF support in Promtail (#10684)	2 years ago