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# Changelog
## 2.50.0-rc.0 / 2024-02-07
* [CHANGE] Remote Write: Error `storage.ErrTooOldSample` is now generating HTTP error 400 instead of HTTP error 500. #13335
* [FEATURE] Remote Write: Drop old inmemory samples. Activated using the config entry `sample_age_limit` . #13002
* [FEATURE] **Experimental** : Add support for ingesting zeros as created timestamps. (enabled under the feature-flag `created-timestamp-zero-ingestion` ). #12733 #13279
* [FEATURE] Promtool: Add `analyze` histograms command. #12331
* [FEATURE] TSDB/compaction: Add a way to enable overlapping compaction. #13282 #13393 #13398
* [FEATURE] Add automatic memory limit handling. Activated using the feature flag. `auto-gomemlimit` #13395
* [ENHANCEMENT] Promtool: allow specifying multiple matchers in `promtool tsdb dump` . #13296
* [ENHANCEMENT] PromQL: Restore more efficient version of `NewPossibleNonCounterInfo` annotation. #13022
* [ENHANCEMENT] Kuma SD: Extend configuration to allow users to specify client ID. #13278
* [ENHANCEMENT] PromQL: Use natural sort in `sort_by_label` and `sort_by_label_desc` . This is **experimental** . #13411
* [ENHANCEMENT] Native Histograms: support `native_histogram_min_bucket_factor` in scrape_config. #13222
* [ENHANCEMENT] Native Histograms: Issue warning if histogramRate is applied to the wrong kind of histogram. #13392
* [ENHANCEMENT] TSDB: Make transaction isolation data structures smaller. #13015
* [ENHANCEMENT] TSDB/postings: Optimize merge using Loser Tree. #12878
* [ENHANCEMENT] TSDB: Simplify internal series delete function. #13261
* [ENHANCEMENT] Agent: Performance improvement by making the global hash lookup table smaller. #13262
* [ENHANCEMENT] PromQL: faster execution of metric functions, e.g. abs(), rate() #13446
* [ENHANCEMENT] TSDB: Optimize label values with matchers by taking shortcuts. #13426
* [ENHANCEMENT] Kubernetes SD: Check preconditions earlier and avoid unnecessary checks or iterations in kube_sd. #13408
* [ENHANCEMENT] Promtool: Improve visibility for `promtool test rules` with JSON colored formatting. #13342
* [ENHANCEMENT] Consoles: Exclude iowait and steal from CPU Utilisation. #9593
* [ENHANCEMENT] Various improvements and optimizations on Native Histograms. #13267 , #13215 , #13276 #13289 , #13340
* [BUGFIX] Scraping: Fix quality value in HTTP Accept header. #13313
* [BUGFIX] UI: Fix usage of the function `time()` that was crashing. #13371
## 2.49.1 / 2024-01-15
* [BUGFIX] TSDB: Fixed a wrong `q=` value in scrape accept header #13313