Release 2.31.0-rc.0 (#9556)

* Release 2.31.0-rc.0

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

CHANGELOG.md

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+## 2.31.0-rc.0 / 2021-10-21
+
+* [FEATURE] PromQL: Add trigonometric functions and `atan2` binary operator. #9239 #9248 #9515
+* [FEATURE] Remote: Add support for exemplar in the remote write receiver endpoint. #9319 #9414
+* [FEATURE] SD: Add PuppetDB service discovery. #8883
+* [FEATURE] SD: Add Uyuni service discovery. #8190
+* [FEATURE] Web: Add support for security-related HTTP headers. #9546
+* [ENHANCEMENT] Azure SD: Add `proxy_url`, `follow_redirects`, `tls_config`. #9267
+* [ENHANCEMENT] Backfill: Add `--max-block-duration` in `promtool create-blocks-from rules`. #9511
+* [ENHANCEMENT] Config: Print human-readable sizes with unit instead of raw numbers. #9361
+* [ENHANCEMENT] HTTP: Re-enable HTTP/2. #9398
+* [ENHANCEMENT] Kubernetes SD: Warn user if number of endpoints exceeds limit. #9467
+* [ENHANCEMENT] OAuth2: Add TLS configuration to token requests. #9550
+* [ENHANCEMENT] PromQL: Several optimizations. #9365 #9360 #9362 #9552
+* [ENHANCEMENT] PromQL: Make aggregations deterministic in instant queries. #9459
+* [ENHANCEMENT] Rules: Add the ability to limit number of alerts or series. #9260 #9541
+* [ENHANCEMENT] SD: Experimental discovery manager to avoid restarts upon reload. Disabled by default, enable with flag `--enable-feature=new-service-discovery-manager`. #9349 #9537
+* [ENHANCEMENT] UI: Debounce timerange setting changes. #9359
+* [BUGFIX] Backfill: Apply rule labels after query labels. #9421
+* [BUGFIX] Scrape: Resolve conflicts between multiple exported label prefixes. #9479 #9518
+* [BUGFIX] Scrape: Restart scrape loops when `__scrape_interval__` is changed. #9551
+* [BUGFIX] TSDB: Fix memory leak in samples deletion. #9151
+* [BUGFIX] UI: Use consistent margin-bottom for all alert kinds. #9318
+
 ## 2.30.3 / 2021-10-05
 
 * [BUGFIX] TSDB: Fix panic on failed snapshot replay. #9438

VERSION

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-2.30.3
+2.31.0-rc.0