benchmark instructions probably belong in their own howto

howto/cache.md

@@ -432,6 +432,8 @@ See [#32239](https://bugs.torproject.org/32239) for a followup on the launch pro
 
 Will require a test VM (or two?) to hit the caches.
 
+TODO: migrate this to a separate howto?
+
 ### Common procedure
 
  1. punch a hole in the firewall to allow cache2 to access cache1