Project: Grafana Mimir (Observability and Analysis / Observability)
File: about-versioning.md

aliases: ../configuring/about-versioning/ description: Learn about guarantees for this Grafana Mimir major release. menuTitle: Versioning title: About Grafana Mimir versioning weight: 50 This topic describes our guarantees for this Grafana Mimir major release. Upgrading Grafana Mimir from one minor version to the next minor version should work, but we don't want to bump the major version every time we remove a configuration parameter. We will keep in place for two minor releases. You can use the `deprecatedflagsinuse_total` metric to generate an alert that helps you determine if you're using a deprecated flag. These guarantees don't apply to . The Grafana Mimir maintainers commit to ensuring that future versions can read data written by versions within the last two years. In practice, we expect to be able to read data written more than two years ago, but a minimum of two years is our guarantee. Grafana Mimir strives to be 100% compatible with the Prometheus HTTP API which is by default served by endpoints with the /prometheus HTTP path prefix `/prometheus/*`. We consider any deviation from this 100% API compatibility to be a bug, except for the following scenarios: Additional API endpoints for creating, removing, modifying alerts, and recording rules. Additional APIs that push metrics (under `/prometheus/api/push`). Additional API endpoints for management of Grafana Mimir, such as the ring. These APIs are not included in any compatibility guarantees. . Grafana Mimir is an actively developed project and we encourage the introduction of new features and capabilities. Not everything in each release of Grafana Mimir is considered production-ready. We mark as "Experimental" all features and flags that we don't consider production-ready. We do not guarantee backwards compatibility for experimental features and flags. Experimental configuration and flags are subject to change. The following features are currently experimental: Alertmanager Enable a set of experimental API endpoints to help support the migration of the Grafana Alertmanager to the Mimir Alertmanager. `-alertmanager.grafana-alertmanager-compatibility-enabled` Enable support for any UTF-8 character as part of Alertmanager configuration/API matchers and labels. `-alertmanager.utf8-strict-mode-enabled` Compactor Enable cleanup of remaining files in the tenant bucket when there are no blocks remaining in the bucket index. `-compactor.no-blocks-file-cleanup-enabled` Ruler Tenant federation Disable alerting and recording rules evaluation on a per-tenant basis `-ruler.recording-rules-evaluation-enabled` `-ruler.alerting-rules-evaluation-enabled` Aligning of evaluation timestamp on interval (`alignevaluationtimeoninterval`) Distributor Metrics relabeling `-distributor.metric-relabeling-enabled` Using status code 529 instead of 429 upon rate limit exhaustion. `distributor.service-overload-status-code-on-rate-limit-enabled` Set Retry-After header in recoverable error responses `-distributor.retry-after-header.enabled` `-distributor.retry-after-header.base-seconds` `-distributor.retry-after-header.max-backoff-exponent` Limit exemplars per series per request `-distributor.max-exemplars-per-series-per-request` Enforce a maximum pool buffer size for write requests `-distributor.max-request-pool-buffer-size` Hash ring Disabling ring heartbeat timeouts `-distributor.ring.heartbeat-timeout=0` `-ingester.ring.heartbeat-timeout=0` `-ruler.ring.heartbeat-timeout=0` `-alertmanager.sharding-ring.heartbeat-timeout=0` `-compactor.ring.heartbeat-timeout=0` `-store-gateway.sharding-ring.heartbeat-timeout=0` `-overrides-exporter.ring.heartbeat-timeout=0` Disabling ring heartbeats `-distributor.ring.heartbeat-period=0` `-ingester.ring.heartbeat-period=0` `-ruler.ring.heartbeat-period=0` `-alertmanager.sharding-ring.heartbeat-period=0` `-compactor.ring.heartbeat-period=0` `-store-gateway.sharding-ring.heartbeat-period=0`

Ingester Add variance to chunks end time to spread writing across time (`-blocks-storage.tsdb.head-chunks-end-time-variance`) Snapshotting of in-memory TSDB data on disk when shutting down (`-blocks-storage.tsdb.memory-snapshot-on-shutdown`) Out-of-order samples ingestion (`-ingester.out-of-order-time-window`) Shipper labeling out-of-order blocks before upload to cloud storage (`-ingester.out-of-order-blocks-external-label-enabled`) Postings for matchers cache configuration: `-blocks-storage.tsdb.head-postings-for-matchers-cache-ttl` `-blocks-storage.tsdb.head-postings-for-matchers-cache-size` (deprecated) `-blocks-storage.tsdb.head-postings-for-matchers-cache-max-bytes` `-blocks-storage.tsdb.head-postings-for-matchers-cache-force` `-blocks-storage.tsdb.block-postings-for-matchers-cache-ttl` `-blocks-storage.tsdb.block-postings-for-matchers-cache-size` (deprecated) `-blocks-storage.tsdb.block-postings-for-matchers-cache-max-bytes` `-blocks-storage.tsdb.block-postings-for-matchers-cache-force` CPU/memory utilization based read request limiting: `-ingester.read-path-cpu-utilization-limit` `-ingester.read-path-memory-utilization-limit"` Early TSDB Head compaction to reduce in-memory series: `-blocks-storage.tsdb.early-head-compaction-min-in-memory-series` `-blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage` Timely head compaction (`-blocks-storage.tsdb.timely-head-compaction-enabled`) Count owned series and use them to enforce series limits: `-ingester.track-ingester-owned-series` `-ingester.use-ingester-owned-series-for-limits` `-ingester.owned-series-update-interval` Ingester client Per-ingester circuit breaking based on requests timing out or hitting per-instance limits `-ingester.client.circuit-breaker.enabled` `-ingester.client.circuit-breaker.failure-threshold` `-ingester.client.circuit-breaker.failure-execution-threshold` `-ingester.client.circuit-breaker.period` `-ingester.client.circuit-breaker.cooldown-period` Querier Use of Redis cache backend (`-blocks-storage.bucket-store.metadata-cache.backend=redis`) Streaming chunks from store-gateway to querier (`-querier.prefer-streaming-chunks-from-store-gateways`, `-querier.streaming-chunks-per-store-gateway-buffer-size`) Limiting queries based on the estimated number of chunks that will be used (`-querier.max-estimated-fetched-chunks-per-query-multiplier`) Max concurrency for tenant federated queries (`-tenant-federation.max-concurrent`) Maximum response size for active series queries (`-querier.active-series-results-max-size-bytes`) Enable PromQL experimental functions (`-querier.promql-experimental-functions-enabled`) Allow streaming of `/active_series` responses to the frontend (`-querier.response-streaming-enabled`) Streaming PromQL engine (`-querier.promql-engine=streaming` and `-querier.enable-promql-engine-fallback`) Query-frontend `-query-frontend.querier-forget-delay` Instant query splitting (`-query-frontend.split-instant-queries-by-interval`) Lower TTL for cache entries overlapping the out-of-order samples ingestion window (re-using `-ingester.out-of-order-allowance` from ingesters) Use of Redis cache backend (`-query-frontend.results-cache.backend=redis`) Query blocking on a per-tenant basis (configured with the limit `blocked_queries`) Max number of tenants that may be queried at once (`-tenant-federation.max-tenants`) Sharding of active series queries (`-query-frontend.shard-active-series-queries`) Server-side write timeout for responses to active series requests (`-query-frontend.active-series-write-timeout`) Query-scheduler `-query-scheduler.querier-forget-delay` Store-gateway Use of Redis cache backend (`-blocks-storage.bucket-store.chunks-cache.backend=redis`, `-blocks-storage.bucket-store.index-cache.backend=redis`, `-blocks-storage.bucket-store.metadata-cache.backend=redis`) `-blocks-storage.bucket-store.series-selection-strategy` Eagerly loading some blocks on startup even when lazy loading is enabled `-blocks-storage.bucket-store.index-header.eager-loading-startup-enabled` Set a timeout for index-header lazy loading (`-blocks-storage.bucket-store.index-header.lazy-loading-concurrency-queue-timeout`) Read-write deployment mode API endpoints: `/api/v1/user_limits` `/api/v1/cardinality/active_series` Metric separation by an additionally configured group label `-validation.separate-metrics-group-label` `-max-separate-metrics-groups-per-user` Vault Fetching TLS secrets from Vault for various clients (`-vault.enabled`) Vault client authentication token lifetime watcher. Ensures the client token is always valid by renewing the token lease or re-authenticating. Includes the metrics: `cortexvaulttokenleaserenewal_active` `cortexvaulttokenleaserenewalsuccesstotal` `cortexvaultauthsuccesstotal` Logger Rate limited logger support `log.rate-limit-enabled` `log.rate-limit-logs-per-second` `log.rate-limit-logs-burst-size` Memcached client Customise write and read buffer size `-<prefix>.memcached.write-buffer-size-bytes` `-<prefix>.memcached.read-buffer-size-bytes` Timeseries Unmarshal caching optimization in distributor (`-timeseries-unmarshal-caching-optimization-enabled`) Reusing buffers for marshalling write requests in distributors (`-distributor.write-requests-buffer-pooling-enabled`) Logging of requests that did not send any HTTP request: `-server.http-log-closed-connections-without-response-enabled`. Ingester: track "owned series" and use owned series instead of in-memory series for tenant limits. `-ingester.use-ingester-owned-series-for-limits` `-ingester.track-ingester-owned-series` `-ingester.owned-series-update-interval` Server support `-server.proxy-protocol-enabled` Deprecated features are usable up until the release that indicates their removal. For details about what deprecated means, see . The following features or configuration parameters are currently deprecated and will be removed in Mimir 2.13: Logging `-log.buffered` The following features or configuration parameters are currently deprecated and will be removed in Mimir 2.14: Distributor the metric `cortexdistributorsampledelayseconds` Ingester `-ingester.return-only-grpc-errors` Ingester client `-ingester.client.report-grpc-codes-in-instrumentation-label-enabled` Mimirtool the flag `--rule-files`