Showing content from https://github.com/prometheus/prometheus/releases/latest below:
Release 3.5.0 / 2025-07-14 · prometheus/prometheus · GitHub
3.5 is a Long Term Support (LTS) release; see release https://prometheus.io/docs/introduction/release-cycle/
There are a number of new features, and no known breaking changes in this release:
- [FEATURE] PromQL: Add experimental type and unit metadata labels, behind feature flag
type-and-unit-labels. #16228 #16632 #16718 #16743
- [FEATURE] PromQL: Add
ts_of_(min|max|last)_over_time, behind feature flag experimental-promql-functions. #16722 #16733
- [FEATURE] Scraping: Add global option
always_scrape_classic_histograms to scrape a classic histogram even if it is also exposed as native. #16452
- [FEATURE] OTLP: New config options
promote_all_resource_attributes and ignore_resource_attributes. #16426
- [FEATURE] Discovery: New service discovery for STACKIT Cloud. #16401
- [ENHANCEMENT] Hetzner SD: Add
label_selector to filter servers. #16512
- [ENHANCEMENT] PromQL: support non-constant parameter in aggregations like
quantile and topk. #16404
- [ENHANCEMENT] UI: Better total target count display when using
keep_dropped_targets option. #16604
- [ENHANCEMENT] UI: Add simple filtering on the
/rules page. #16605
- [ENHANCEMENT] UI: Display query stats in hover tooltip over table query tab. #16723
- [ENHANCEMENT] UI: Clear search field on
/targets page. #16567
- [ENHANCEMENT] Rules: Check that rules parse without error earlier at startup. #16601
- [ENHANCEMENT] Promtool: Optional fuzzy float64 comparison in rules unittests. #16395
- [PERF] PromQL: Reuse
histogramStatsIterator where possible. #16686
- [PERF] PromQL: Reuse storage for custom bucket values for native histograms. #16565
- [PERF] UI: Optimize memoization and search debouncing on
/targets page. #16589
- [PERF] UI: Fix full-page re-rendering when opening status nav menu. #16590
- [PERF] Kubernetes SD: use service cache.Indexer to achieve better performance. #16365
- [PERF] TSDB: Optionally use Direct IO for chunks writing. #15365
- [PERF] TSDB: When fetching label values, stop work earlier if the limit is reached. #16158
- [PERF] Labels: Simpler/faster stringlabels encoding. #16069
- [PERF] Scraping: Reload scrape pools concurrently. #16595 #16783
- [BUGFIX] Top-level: Update GOGC before loading TSDB. #16491
- [BUGFIX] Config: Respect GOGC environment variable if no "runtime" block exists. #16558
- [BUGFIX] PromQL: Fix native histogram
last_over_time. #16744
- [BUGFIX] PromQL: Fix reported parser position range in errors for aggregations wrapped in ParenExpr #16041 #16754
- [BUGFIX] PromQL: Don't emit a value from
histogram_fraction or histogram_quantile if classic and native histograms are present at the same timestamp. #16552
- [BUGFIX] PromQL: Incorrect rounding of
[1001ms] to [1s] and similar. #16478
- [BUGFIX] PromQL: Fix inconsistent / sometimes negative
histogram_count and histogram_sum. #16682
- [BUGFIX] PromQL: Improve handling of NaNs in native histograms. #16724
- [BUGFIX] PromQL: Fix unary operator precedence in duration expressions. #16713
- [BUGFIX] PromQL: Improve consistency of
avg aggregation and avg_over_time. #16569 #16773
- [BUGFIX] UI: Add query warnings and info to graph view. #16753 #16759
- [BUGFIX] API: Add HTTP
Vary: Origin header to responses to avoid cache poisoning. #16008
- [BUGFIX] Discovery: Avoid deadlocks by taking locks in consistent order. #16587
- [BUGFIX] Remote-write: For Azure AD auth, allow empty
client_id to suppport system assigned managed identity. #16421
- [BUGFIX] Scraping: Fix rare memory corruption bug. #16623
- [BUGFIX] Scraping: continue handling custom-bucket histograms after an exponential histogram is encountered. #16720
- [BUGFIX] OTLP: Default config not respected when
otlp: block is unset. #16693
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