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Flaky test: TestCompactor_ShouldCompactAllUsersOnShardingEnabledButOnlyOneInstanceRunning (arm64) — userIndexUpdateLoop ring errors leak into the exact log-set assertion

type/flaky-test

Status: Open.

#7826 In cortexproject/cortex;

· CharlieTLe opened on Sep 3, 2026

make modernize will break on the next Go pkgbits bump

ci/cd

type/choreSomething that needs to be done; not a bug or a feature Something that needs to be done; not a bug or a feature

Status: Open.

#7818 In cortexproject/cortex;

· friedrichg opened on Aug 27, 2026

Flaky test: TestVerticalShardingFuzz — or vector(...) returns the vector() fallback instead of the LHS when vertical sharding is enabled

component/query-frontend

type/bug

type/flaky-test

Status: Open.

#7804 In cortexproject/cortex;

· CharlieTLe opened on Aug 21, 2026

MakeIngesterClient leaks grpc.ClientConn and goroutines on failure

component/distributor

component/ingester

type/bug

Status: Open.

#7759 In cortexproject/cortex;

· alex-berger opened on Aug 12, 2026

Noticed Cortex Query Timeout and Data Inconsistency Issues

component/querier

type/bug

Status: Open.

#7733 In cortexproject/cortex;

· rmhaisane opened on Jul 27, 2026

detachChunksFromBuffer copies chunk data that Unmarshal already allocated separately (#7670)

component/querier

type/bug

Status: Open.

#7732 In cortexproject/cortex;

· sandy2008 opened on Jul 27, 2026

cortex_ingester_ingestion_delay_seconds loses ~86% of observations: NativeHistogramMinResetDuration is 1ns, not 1h

type/bug

Status: Open.

#7731 In cortexproject/cortex;

· sandy2008 opened on Jul 27, 2026

Querier bucket-scan blocks finder: per-tenant metas maps grow unboundedly and keep serving deleted tenants while scans keep partially failing

component/querier

type/bug

type/productionIssues related to the production use of Cortex, inc. configuration, alerting and operating. Issues related to the production use of Cortex, inc. configuration, alerting and operating.

Status: Open.

#7728 In cortexproject/cortex;

· sandy2008 opened on Jul 27, 2026

Querier bucket-scan blocks finder and store-gateway wipe each other's meta-syncer cache in single-binary mode

component/querier

component/store-gateway

type/bug

Status: Open.

#7727 In cortexproject/cortex;

· sandy2008 opened on Jul 27, 2026

Flaky test: TestPartitionCompactor_DeleteLocalSyncFiles (arm64) — data race in thanos extprom.TxGaugeVec via concurrent MetaFetcher.Fetch

component/compactor

type/flaky-test

Status: Open.

#7707 In cortexproject/cortex;

· yeya24 opened on Jul 20, 2026

Some logs ignore the JSON log format setting

type/bug

Status: Open.

#7697 In cortexproject/cortex;

· jakubgs opened on Jul 17, 2026

Flaky test: TestPartitionCompactor_ShouldCompactOnlyUsersOwnedByTheInstanceOnShardingEnabledAndMultipleInstancesRunning — 60s CompactionRunsCompleted poll times out

component/compactor

type/flaky-test

Status: Open.

#7607 In cortexproject/cortex;

· sandy2008 opened on Jun 8, 2026