cryptoe opened a new pull request, #19271:
URL: https://github.com/apache/druid/pull/19271

   Add QoS filtering to the Coordinator to protect health check endpoints under 
load
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                              
   The Coordinator had no request throttling, meaning a burst of slow API 
requests (segment load status, datasource queries, compaction configs, etc.) 
could exhaust the Jetty thread pool and make /status/health and /status/ready 
unresponsive. This is the same problem the Overlord solved in #18033 for its 
action endpoints.


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