Release notes

v3.8.5

Enhancements

• Reworked historical block storage with a new block-manager engine, improving compaction planning and adding block layout diagnostics metrics.
• Core dumps are no longer written on crash, preventing unexpected disk usage in constrained environments such as Kubernetes.
• Added metrics for observing the internal data storage.
• Improved performance of label processing and index writing.

Bug fixes

• Updated the build toolchain and dependencies, addressing known security vulnerabilities.

v3.8.4

Enhancements

• Improved instant query performance.
• Reduced memory consumption during head rotation and when processing high-cardinality metrics through the federation API.

Bug fixes

• Updated base images and security-related components.

v3.8.3

Bug fixes

• Fixed a vulnerability that could lead to memory exhaustion when processing remote read queries.
• Fixed multiple XSS vulnerabilities in the web interface.
• Fixed a chunk encoder issue that could, in rare cases, lead to historical data corruption.
• Updated PromQL range query behavior to match the current Prometheus implementation. As a result, the output of the rate, sum_over_time, and count_over_time functions may differ slightly from previous versions.

v3.8.1

Enhancements

• Improved data processing performance and reduced memory consumption when executing queries in sharded environments.

Bug fixes

• Fixed WAL processing during shard rotation.
• Updated dependencies and addressed known security vulnerabilities.

v3.8.0

Enhancements

• Added metrics for analyzing mutex and semaphore contention in the Go runtime.
• Added a metric for jemalloc resident memory usage.
• Improved resource cleanup during WAL rotation.

v3.7.11

Enhancements

• Added metrics for monitoring jemalloc arena reuse efficiency.

v3.7.10

Enhancements

• Added support for WAL v2 format in remote write.

Bug fixes

• Fixed false positives for the PrometheusRemoteWriteDesiredShards alert.
• Resolved potential issues affecting remote write under high load.

v3.7.9

Enhancements

• Added new PromQL functions: op_defined, op_replace_nan, op_smoothie, op_zero_if_none, and op_top.
• Improved remote write performance.
• Added a data age limit for remote write to prevent WAL file accumulation when external systems are unavailable.

Bug fixes

• Fixed ingestion metric calculations.
• Resolved increasing memory consumption when using custom jemalloc arenas.
• Updated dependencies and addressed known security vulnerabilities.

v3.7.6

Enhancements

• Improved rule evaluation and remote write performance.

Bug fixes

• Updated security-related dependencies.

v3.7.5

Enhancements

• Optimized data ingestion and processing workflows.

v3.7.4

Enhancements

• Added support for splitting high-cardinality metrics when using the federation API, reducing peak memory consumption.

v3.7.2

Bug fixes

• Fixed stability issues that could cause intermittent failures.
• Fixed handling of empty labels in OTLP Protobuf.
• Improved rule evaluation and query execution performance.

v3.7.0

Enhancements

• Data copying during rotation is now performed in the background, reducing the impact of rotation on system responsiveness.
• Improved query execution and rule evaluation performance.

Bug fixes

• Fixed handling of StaleNaN values during data rotation.

v3.6.5

Enhancements

• Added a mechanism for offloading infrequently used time series to disk, significantly reducing memory consumption in large-scale deployments.
• Reduced memory consumption during metrics collection and processing.

Bug fixes

• Fixed regular expression handling in matchers.
• Improved resilience to corrupted WAL files and invalid data.
• Fixed handling of StaleNaN values for backfilled data.

v3.5.0

Enhancements

• Upgraded the underlying Prometheus version to 2.55.1.
• Added support for the Prometheus 3.x storage format.

Bug fixes

• Updated dependencies and addressed known security vulnerabilities.