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Mat Schaffer 3b4bd12db9 Helm: Allow emptyDir data volumes for backend and write (#10338) ... **What this PR does / why we need it**: This enables deployment of write and backend modules using emptyDir in place of a PersistentVolume for the data volume. This is useful for Kuberenetes clusters (for example, on-prem) that are unable to easily provide persistent volumes. This is intended for use with something like s3 storage where (per [comment](45b127cfd6/production/helm/loki/templates/backend/statefulset-backend.yaml (L30-L33)) on `persistentVolumeClaimRetentionPolicy`) > Data on the (write or backend) nodes is easy to replace ... and will rely on re-fetching data when needed. **Which issue(s) this PR fixes**: Fixes #9131 **Special notes for your reviewer**: If there are other modules this should be applied to, please let me know. I'm just getting started with Loki this month and have added only the modules which come with the default chart (gateway, read, write, backend) and make persistent volume claims (write, backend). **Checklist** - [x] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [x] Documentation added - ~Tests updated~ - no tests for modified helm modules found - ~`CHANGELOG.md` updated~ - not used for helm changes - ~If the change is worth mentioning in the release notes, add `add-to-release-notes` label~ - unlikely to be noteworthy - ~Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md`~ - not related to loki upgrade - [x] 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> Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>		2 years ago
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configure-storage	[Docs] Create top-level Setup section (#9974)	2 years ago
install-monolithic	[Docs] Create top-level Setup section (#9974)	2 years ago
install-scalable	[docs] Update deployment modes topic and graphics (#10589)	2 years ago
monitor-and-alert	[Docs] Fix 404s/broken links in main branch (#10556)	2 years ago
_index.md	[Docs] Create top-level Setup section (#9974)	2 years ago
concepts.md	[Docs] Create top-level Setup section (#9974)	2 years ago
reference.md	Helm: Allow emptyDir data volumes for backend and write (#10338)	2 years ago