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+---
+title: "Grafana Mimir version 2.13 release notes"
+menuTitle: "V2.13 release notes"
+description: "Release notes for Grafana Mimir version 2.13"
+weight: 1100
+---
+
+# Grafana Mimir version 2.13 release notes
+
+<!-- vale Grafana.GoogleWill = NO -->
+<!-- vale Grafana.Timeless = NO -->
+<!-- Release notes are often future focused -->
+
+Grafana Labs is excited to announce version 2.13 of Grafana Mimir.
+
+The highlights that follow include the top features, enhancements, and bug fixes in this release.
+For the complete list of changes, refer to the [CHANGELOG](https://github.com/grafana/mimir/blob/main/CHANGELOG.md).
+
+## Features and enhancements
+
+- **Improved CPU performance in processing queries with regular expressions** that contain many alternations (for example `foo|bar|baz|...`).
+
+- **Improved OTLP ingestion performance** by using native translation, which reduces memory usage in the distributor by up to 30% and CPU usage by up to 8%.
+
+- Configurable S3 bucket lookup type improves interoperability with **S3-compatible providers, such as Tencent and Alibaba**. Configure lookup type via `-<prefix>.s3.bucket-lookup-type` or `-common.storage.s3-bucket-lookup-type`.
+
+- **Configuration of TLS for S3 buckets** is now possible via `-<prefix>.s3.http.*` and `-common.storage.s3.http.*` configuration options.
+
+- **Mimirtool can now verify the validity of a Mimir runtime configuration** file with the `mimirtool runtime-config verify` command.
+
+- **Active series are now updated along with owned series.** This means the number of active series for a tenant is more accurate after scaling out ingesters. As a result, ingesters now more precisely enforce tenants' series limits. This feature is only enabled when `-ingester.track-ingester-owned-series` or `-ingester.use-ingester-owned-series-for-limits` are enabled.
+
+- **Store-gateway can be configured to explicitly disable or enable tenants**. This is useful in cases where compaction slows down for a tenant to temporarily exclude another tenant while compaction catches up without affecting other tenants.
+
+- **Remote read (`/prometheus/api/v1/read`) is becoming a first-class endpoint in Mimir** with support in `query stats` logs and query blocking in the query-frontend. More coming in future releases.
+
+Additionally, the following previously experimental features are now considered stable:
+
+- Rules tenant federation via the `source_tenants` field in rule groups.
+- Enabling recording, and alerting rules evaluation on a per-tenant basis.
+- Limiting the number of tenants a federated query can query.
+
+## Important changes
+
+In Grafana Mimir 2.13 the following behavior has changed:
+
+- The default Docker image `grafana/mimir` is now based on the distroless image `gcr.io/distroless/static-debian12`.
+  See [Debugging distroless container images](https://grafana.com/docs/mimir/latest/manage/mimir-runbooks/#debugging-distroless-container-images-in-kubernetes) for more details on how to
+  work with distroless images.
+
+- Error logs in the ingester are now sampled at 10% by default. Sampled log lines contain `(sampled 1/10)`. The `cortex_discarded_samples_total` metric still tracks all discarded samples.
+
+- Anonymous usage statistics now include actual CPU usage instead of available CPU cores.
+
+- Continuous-test is no longer a standalone binary and is now part of Mimir as its own target. The published Docker image has been updated to use the new packaging.
+
+The following deprecated configuration options are removed in Grafana Mimir 2.13:
+
+- The configuration option `-log.buffered`, which was deprecated in 2.11 and is now enabled by default.
+
+## Experimental features
+
+Grafana Mimir 2.13 includes new features that are considered experimental and disabled by default.
+Use them with caution and report any issues you encounter:
+
+- Experimental support for server-side circuit breakers in ingesters on read and write requests. This can be enabled using `-ingester.push-circuit-breaker.enabled` and `-ingester.read-circuit-breaker.enabled` options and further configured via the `-ingester.push-circuit-breaker.*` and `-ingester.read-circuit-breaker.*` options.
+
+The following configuration options are deprecated and will be removed in a future Grafana Mimir release:
+
+- `evaluation_delay` field in the rule group configuration has been deprecated. Please use `query_offset` instead.
+
+## Bug fixes
+
+- OTLP ingestion: translate all HTTP 5xx errors into one of 502, 503, or 504, so that the otel-collector retries the failed requests.
+- OTLP ingestion: return properly formatted protobuf error messages when ingestion fails.
+- OTLP ingestion: generate `target_info` metric only when there are metrics in the request and there is at least one configured identifying label.
+- OTLP ingestion: don't discard timeseries paired with invalid exemplars. Instead, try to ingest the timeseries and discard only the invalid exemplars.
+- Subqueries: `@ end()` and `@ start()` now work correctly with queries split by time.
+- Native histograms: order exemplars before ingestion to improve success rate when ingesting multiple exemplars.
+- Native histograms: return HTTP 400 on invalid native histogram samples instead of HTTP 500. The metric `cortex_discarded_samples_total{reason="invalid-native-histogram"}` is now incremented on invalid histogram samples.
+
+### Helm chart improvements
+
+The Grafana Mimir and Grafana Enterprise Metrics Helm charts are released independently.
+Refer to the [Grafana Mimir Helm chart documentation](/docs/helm-charts/mimir-distributed/latest/).