• [FEATURE] Promtool: Retroactive rule evaluation functionality. #7675
• [FEATURE] Configuration: Environment variable expansion for external labels. Behind --enable-feature=expand-external-labels flag. #8649
• [FEATURE] TSDB: Add a flag(-storage.tsdb.max-chunk-size) to control chunk allocation size for small Prometheus instances. #8478
• [FEATURE] UI: Add a dark theme. #8604
• [FEATURE] AWS Lightsail Discovery: Add AWS Lightsail Discovery. #8693
• [FEATURE] Docker Discovery: Add Docker Service Discovery. #8629
• [FEATURE] OAuth: Allow OAuth 2.0 to be used anywhere an HTTP client is used. #8761
• [FEATURE] Remote Write: Send exemplars via remote write. Experimental and disabled by default. #8296
• [ENHANCEMENT] Digital Ocean Discovery: Add __meta_digitalocean_vpc label. #8642
• [ENHANCEMENT] Scaleway Discovery: Read Scaleway secret from a file. #8643
• [ENHANCEMENT] Scrape: Add configurable limits for label size and count. #8777
• [ENHANCEMENT] UI: Add 16w and 26w time range steps. #8656
• [ENHANCEMENT] Templating: Enable parsing strings in humanize functions. #8682
• [BUGFIX] UI: Provide errors instead of blank page on TSDB Status Page. #8654 #8659
• [BUGFIX] TSDB: Do not panic when writing very large records to the WAL. #8790
• [BUGFIX] TSDB: Avoid panic when mmaped memory is referenced after the file is closed. #8723
• [BUGFIX] Scaleway Discovery: Fix nil pointer dereference. #8737
• [BUGFIX] Consul Discovery: Restart no longer required after config update with no targets. #8766