prometheus/prometheus v3.10.0-rc.1

3.10.0-rc.1 / 2026-02-19

on GitHub

Prometheus now offers a distroless Docker image variant alongside the default
busybox image. The distroless variant provides enhanced security with a minimal
base image, uses UID/GID 65532 (nonroot) instead of nobody, and removes the
VOLUME declaration. Both variants are available with -busybox and -distroless
tag suffixes (e.g., prom/prometheus:latest-busybox, prom/prometheus:latest-distroless).
The busybox image remains the default with no suffix for backwards compatibility
(e.g., prom/prometheus:latest points to the busybox variant).

For users migrating existing named volumes from the busybox image to the distroless variant, the ownership can be adjusted with:

docker run --rm -v prometheus-data:/prometheus alpine chown -R 65532:65532 /prometheus

Then, the container can be started with the old volume with:

docker run -v prometheus-data:/prometheus prom/prometheus:latest-distroless

User migrating from bind mounts might need to ajust permissions too, depending on their setup.

• [CHANGE] Alerting: Add alertmanager dimension to following metrics: prometheus_notifications_dropped_total, prometheus_notifications_queue_capacity, prometheus_notifications_queue_length. #16355
• [CHANGE] UI: Hide expanded alert annotations by default, enabling more information density on the /alerts page. #17611
• [FEATURE] AWS SD: Add MSK Role. #17600
• [FEATURE] PromQL: Add fill() / fill_left() / fill_right() binop modifiers for specifying default values for missing series. #17644
• [FEATURE] Web: Add OpenAPI 3.2 specification for the HTTP API at /api/v1/openapi.yaml. #17825
• [FEATURE] Dockerfile: Add distroless image variant using UID/GID 65532 and no VOLUME declaration. Busybox image remains default. #17876
• [FEATURE] Web: Add on-demand wall time profiling under <URL>/debug/pprof/fgprof. #18027
• [ENHANCEMENT] PromQL: Add more detail to histogram quantile monotonicity info annotations. #15578
• [ENHANCEMENT] Alerting: Independent alertmanager sendloops. #16355
• [ENHANCEMENT] TSDB: Experimental support for early compaction of stale series in the memory with configurable threshold stale_series_compaction_threshold in the config file. #16929
• [ENHANCEMENT] Service Discovery: Service discoveries are now removable from the Prometheus binary through the Go build tag remove_all_sd and individual service discoveries can be re-added with the build tags enable_<sd name>_sd. Users can build a custom Prometheus with only the necessary SDs for a smaller binary size. #17736
• [ENHANCEMENT] Promtool: Support promql syntax features promql-duration-expr and promql-extended-range-selectors. #17926
• [PERF] PromQL: Avoid unnecessary label extraction in PromQL functions. #17676
• [PERF] PromQL: Improve performance of regex matchers like .*-.*-.*. #17707
• [PERF] OTLP: Add label caching for OTLP-to-Prometheus conversion to reduce allocations and improve latency. #17860
• [PERF] API: Compute /api/v1/targets/relabel_steps in a single pass instead of re-running relabeling for each prefix. #17969
• [PERF] tsdb: Optimize LabelValues intersection performance for matchers. #18069
• [BUGFIX] PromQL: Prevent query strings containing only UTF-8 continuation bytes from crashing Prometheus. #17735
• [BUGFIX] Web: Fix missing X-Prometheus-Stopping header for /-/ready endpoint in NotReady state. #17795
• [BUGFIX] PromQL: Fix PromQL info() function returning empty results when filtering by a label that exists on both the input metric and target_info. #17817
• [BUGFIX] TSDB: Fix a bug during exemplar buffer grow/shrink that could cause exemplars to be incorrectly discarded. #17863
• [BUGFIX] UI: Fix broken graph display after page reload, due to broken Y axis min encoding/decoding. #17869
• [BUGFIX] TSDB: Fix memory leaks in buffer pools by clearing reference fields (Labels, Histogram pointers, metadata strings) before returning buffers to pools. #17879
• [BUGFIX] PromQL: info function: fix series without identifying labels not being returned. #17898
• [BUGFIX] OTLP: Filter __name__ from OTLP attributes to prevent duplicate labels. #17917
• [BUGFIX] TSDB: Fix division by zero when computing stale series ratio with empty head. #17952
• [BUGFIX] OTLP: Fix potential silent data loss for sum metrics. #17954
• [BUGFIX] PromQL: Fix smoothed interpolation across counter resets. #17988
• [BUGFIX] PromQL: Fix panic with @ modifier on empty ranges. #18020
• [BUGFIX] PromQL: Fix avg_over_time for a single native histogram. #18058