update CHANGELOG and migration guide

Signed-off-by: Jan Fajerski <jfajersk@redhat.com>

CHANGELOG.md

@@ -2,7 +2,12 @@
 
 ## unreleased
 
+## 3.0.0-rc.1 / 2024-11-11
+
+* [CHANGE] Set the `GOMAXPROCS` variable automatically to match the Linux CPU quota. Use `-no-auto-gomaxprocs` to disable it. The `auto-gomaxprocs` feature flag was removed. #15376
+* [CHANGE] Set the `GOMEMLIMIT` variable automatically to match the Linux container memory limit. Use `-no-auto-gomemlimit` to disable it. The `auto-gomemlimit` feature flag was removed. #15373
 * [BUGFIX] Scraping: Don't log errors on empty scrapes. #15357
+* [BUGFIX] UI: fix selector / series formatting for empty metric names. #15341
 
 ## 3.0.0-rc.0 / 2024-10-31
 

docs/migration.md

@@ -31,6 +31,14 @@ This document offers guidance on migrating from Prometheus 2.x to Prometheus 3.0
     `http://example.com/metrics:80` respectively, add them to your target URLs
   - `agent`
     Instead use the dedicated `--agent` CLI flag.
+  - `auto-gomemlimit`
+    Prometheus v3 will automatically set `GOMEMLIMIT` to match the Linux 
+    container memory limit. If there is no container limit, or the process is 
+    running outside of containers, the system memory total is used. To disable 
+    this, `--no-auto-gomemlimit` is available.
+  - `auto-gomaxprocs`
+    Prometheus v3 will automatically set `GOMAXPROCS` to match the Linux 
+    container CPU quota. To disable this, `--no-auto-gomaxprocs` is available.
 
   Prometheus v3 will log a warning if you continue to pass these to 
   `--enable-feature`.