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# Changelog
## 2.39.0-rc.0 / 2022-09-27
* [FEATURE] **experimental** TSDB: Add support for ingesting out-of-order samples. This is configured via `out_of_order_time_window` field in the config file; check config file docs for more info. #11075
* [ENHANCEMENT] API: `/-/healthy` and `/-/ready` API calls now also respond to a `HEAD` request on top of existing `GET` support. #11160
* [ENHANCEMENT] PuppetDB SD: Add `__meta_puppetdb_query` label. #11238
* [ENHANCEMENT] AWS Lightsail SD: Add `__meta_ec2_region` label. #11326
* [ENHANCEMENT] AWS EC2 SD: Add `____meta_lightsail_region` label. #11326
* [ENHANCEMENT] Scrape: Optimise relabeling by re-using memory. #11147
* [ENHANCEMENT] TSDB: Improve WAL replay timings. #10973 #11307 #11319
* [ENHANCEMENT] TSDB: Optimise memory by not storing unnecessary data in the memory. #11280 #11288 #11296
* [ENHANCEMENT] TSDB: Allow overlapping blocks by default. `--storage.tsdb.allow-overlapping-blocks` now has no effect. #11331
* [ENHANCEMENT] UI: Click to copy label-value pair from query result to clipboard. #11229
* [BUGFIX] TSDB: Turn off isolation for Head compaction to fix a memory leak. #11317
* [BUGFIX] TSDB: Fix 'invalid magic number 0' error on Prometheus startup. #11338
* [BUGFIX] PromQL: Properly close file descriptor when logging unfinished queries. #11148
* [BUGFIX] Agent: Fix validation of flag options and prevent WAL from growing more than desired. #9876
## 2.38.0 / 2022-08-16
* [FEATURE]: Web: Add a `/api/v1/format_query` HTTP API endpoint that allows pretty-formatting PromQL expressions. #11036 #10544 #11005
Ganesh Vernekar
2 years ago
committed by