* [BUGFIX] TSDB: fix unknown series errors and possible lost data during WAL replay when series are removed from the head due to inactivity and reappear before the next WAL checkpoint. #16060
## 3.3.0-rc.0 / 2025-03-11
* [FEATURE] PromQL: Implement `idelta()` and `irate()` for native histograms. #15853
* [ENHANCEMENT] Scaleway SD: Add `__meta_scaleway_instance_public_ipv4_addresses` and `__meta_scaleway_instance_public_ipv6_addresses` labels. #14228
* [ENHANCEMENT] TSDB: Reduce locking while reloading blocks. #12920
* [ENHANCEMENT] PromQL: Allow UTF-8 labels in `label_replace()`. #15974
* [ENHANCEMENT] Promtool: `tsdb create-blocks-from openmetrics` can now read from a Pipe. #16011
* [ENHANCEMENT] Rules: Add support for anchors and aliases in rule files. #14957
* [ENHANCEMENT] Dockerfile: Make `/prometheus` writable. #16073
* [ENHANCEMENT] API: Include scrape pool name for dropped targets in `/api/v1/targets`. #16085
* [ENHANCEMENT] UI: Improve time formatting and copying of selectors. #15999#16165
* [ENHANCEMENT] UI: Bring back vertical grid lines and graph legend series toggling instructions. #16163#16164
* [ENHANCEMENT] Mixin: The `cluster` label can be customized using `clusterLabel`. #15826
* [PERF] TSDB: Optimize some operations on head chunks by taking shortcuts. #12659
* [BUGFIX] Scaleway SD: The public IP will no longer be set to `__meta_meta_scaleway_instance_public_ipv4` if it is an IPv6 address. #14228
* [BUGFIX] PromQL: Fix inconsistent behavior with an empty range. #15970
* [BUGFIX] PromQL: Fix inconsistent annotation in `quantile_over_time()`. #16018
* [BUGFIX] PromQL: Prevent `label_join()` from producing duplicates. #15975
* [BUGFIX] PromQL: Ignore native histograms in `scalar()`, `sort()` and `sort_desc()`. #15964
* [BUGFIX] Alerting: Consider alert relabeling when deciding whether alerts are dropped. #15979
* [BUGFIX] Config: Set `GoGC` to the default value in case of an empty configuration. #16052
* [BUGFIX] TSDB: Fix unknown series errors and potential data loss during WAL replay when inactive series are removed from the head and reappear before the next WAL checkpoint. #16060
* [BUGFIX] Scraping: Bump cache iteration after error to avoid false duplicate detections. #16174
* [BUGFIX] PromQL: Fix annotations for binary operations between incompatible native histograms. #15895