Grafana Mimir version 2.6 release notes

Grafana Labs is excited to announce version 2.6 of Grafana Mimir.

The highlights that follow include the top features, enhancements, and bugfixes in this release. For the complete list of changes, see the changelog.

Features and enhancements

Lower memory usage in store-gateway by streaming series results The store-gateway can now stream results back to the querier instead of buffering them. This is expected to greatly reduce peak memory consumption while keeping latency the same. This is still an experimental feature but Grafana Labs is already running it in production and there’s no known issue. This feature can be enabled setting the -blocks-storage.bucket-store.batch-series-size configuration option (if you want to try it out, we recommend you setting to 5000).
Improved stability in store-gateway by removing mmap usage The store-gateway can now use an alternate code path to read index-headers that does not use memory mapped files. This is expected to improve stability of the store-gateway. This is still an experimental feature but Grafana Labs is already running it in production and there’s no known issue. This feature can be enabled setting -blocks-storage.bucket-store.index-header.stream-reader-enabled=true.

Webex support Alertmanager can now use Webex to send alerts.
tenantID template function A new template function tenantID, returning the ID of the tenant owning the alert, has been added.
grafanaExploreURL template function A new template function grafanaExploreURL, returning the URL to the Grafana explore page with range query, has been added.

The Grafana Mimir and Grafana Enterprise Metrics Helm chart is now released independently. See the corresponding documentation for more information.

In Grafana Mimir 2.6 we have removed the following previously deprecated or experimental configuration options:

The CLI flag -blocks-storage.bucket-store.max-concurrent-reject-over-limit and its respective YAML configuration option blocks_storage.bucket_store.max_concurrent_reject_over_limit.
The CLI flag -query-frontend.align-querier-with-step and its respective YAML configuration option frontend.align_querier_with_step.

The following configuration options are deprecated and will be removed in Grafana Mimir 2.8:

The CLI flag -store.max-query-length and its respective YAML configuration option limits.max_query_length have been replaced with -querier.max-partial-query-length and limits.max_partial_query_length.

The following experimental options and features are now stable:

The CLI flag -query-frontend.max-total-query-length and its respective YAML configuration option limits.max_total_query_length.
The CLI flags -distributor.request-rate-limit and -distributor.request-burst-limit and their respective YAML configuration options limits.request_rate_limit and limits.request_rate_burst.
The CLI flag -ingester.max-global-exemplars-per-user and its respective YAML configuration option limits.max_global_exemplars_per_user.
The CLI flag -ingester.tsdb-config-update-period its respective YAML configuration option ingester.tsdb_config_update_period.
The API endpoint /api/v1/query_exemplars.

Alertmanager: Fix template spurious deletion with relative data dir. PR 3604
Security: Update prometheus/exporter-toolkit for CVE-2022-46146. PR 3675
Security: Update golang.org/x/net for CVE-2022-41717. PR 3755
Debian package: Fix post-install, environment file path and user creation. PR 3720
Memberlist: Fix panic during Mimir startup when Mimir receives gossip message before it’s ready. PR 3746
Update github.com/thanos-io/objstore to address issue with Multipart PUT on s3-compatible Object Storage. PR 3802 PR 3821
Querier: Canceled requests are no longer reported as “consistency check” failures. PR 3837 PR 3927
Distributor: Don’t panic when metric_relabel_configs in overrides contains null element. PR 3868
Ingester, Compactor: Fix panic that can occur when compaction fails. PR 3955