HyukjinKwon commented on a change in pull request #31636:
URL: https://github.com/apache/spark/pull/31636#discussion_r582362942



##########
File path: 
core/src/main/scala/org/apache/spark/metrics/sink/PrometheusServlet.scala
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@@ -23,23 +23,19 @@ import javax.servlet.http.HttpServletRequest
 import com.codahale.metrics.MetricRegistry
 import org.eclipse.jetty.servlet.ServletContextHandler
 
-import org.apache.spark.{SecurityManager, SparkConf}
-import org.apache.spark.annotation.Experimental
+import org.apache.spark.SparkConf
 import org.apache.spark.ui.JettyUtils._
 
 /**
- * :: Experimental ::

Review comment:
       It is actually related. If this is marked as an API, I should deprecate 
the security manager first..




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