reiabreu commented on PR #8986:
URL: https://github.com/apache/storm/pull/8986#issuecomment-5381213560

   _Disclaimer: this comment was generated with the help of an LLM._
   
   Compatibility note (this PR is already approved): this changes the default 
from "unset whitelist ⇒ any strategy class is allowed" to "only the strategies 
shipped with Storm." Any cluster that sets a custom 
`topology.scheduler.strategy` will have those topologies **rejected** after 
upgrade until an operator adds the custom class to 
`nimbus.scheduler.strategy.class.whitelist`. It's the intended hardening, but a 
breaking change worth calling out in the release notes.


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