more bullseye todo

howto/upgrades/bullseye.mdwn

@@ -18,6 +18,14 @@ and upgrade progress of the fleet.
 This is missing the entire procedure, which needs to be copied and
 updated from the buster procedure and anarcat's.
 
+Notable changes to do, especially on our infra:
+
+ * [merged /usr will be the default in bullseye + 1](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978636#178) so our
+   (bullseye) installers should be tweaked to remove the
+   `--no-merged-usr` everywhere
+ * we need to change all installers to switch to bullseye (ganeti and
+   hetzner-robot mostly done, remains tsa-misc/fabric stuff)
+
 # Per host progress
 
 When a critical mass of servers have been upgraded and only "hard"