josefk31 commented on code in PR #19742:
URL: https://github.com/apache/kafka/pull/19742#discussion_r2110071531


##########
core/src/main/scala/kafka/server/ClientQuotaManager.scala:
##########
@@ -451,6 +451,37 @@ class ClientQuotaManager(private val config: 
ClientQuotaManagerConfig,
     }
   }
 
+  /**
+   * Helper method to update quotaTypesEnabled which is a bitwise OR 
combination of the enabled quota types.
+   * For example:
+   *  - If UserQuotaEnabled = 2 and ClientIdQuotaEnabled = 1, then 
quotaTypesEnabled = 3 (2 | 1 = 3)
+   *  - If UserClientIdQuotaEnabled = 4 and UserQuotaEnabled = 1, then 
quotaTypesEnabled =  (4 | 1 = 5)
+   *  - If UserClientIdQuotaEnabled = 4 and ClientIdQuotaEnabled = 2, then 
quotaTypesEnabled = 6 (4 | 2 = 6)
+   *  - If all three are enabled (1 | 2 | 4), then quotaTypesEnabled = 7
+   */
+  private def updateQuotaTypes(): Unit = {
+    quotaTypesEnabled =  if (clientQuotaCallbackPlugin.isDefined) {
+        QuotaTypes.CustomQuotas
+      } else {
+        QuotaTypes.NoQuotas
+      }
+
+    activeQuotaEntities.forEach { (entity, _) =>
+      entity match {
+        case KafkaQuotaEntity(Some(_), Some(_)) =>
+          quotaTypesEnabled |= QuotaTypes.UserClientIdQuotaEnabled
+        case KafkaQuotaEntity(Some(_), None) =>
+          quotaTypesEnabled |= QuotaTypes.UserQuotaEnabled
+        case KafkaQuotaEntity(None, Some(_)) =>
+          quotaTypesEnabled |= QuotaTypes.ClientIdQuotaEnabled
+        case _ => // Unexpected entity type
+      }
+    }
+
+    val activeEntities = if (activeQuotaEntities.isEmpty) "No active quota 
entities" else activeQuotaEntities.keys.asScala.map(_.toString).mkString(", ")
+    info(s"Quota types enabled changed to $quotaTypesEnabled with active quota 
entities: [$activeEntities]")

Review Comment:
   Hmm; might make sense to remove the `Quota types enabled changed to %d` bit? 
Main thing we want to avoid is an oncall having to do bit manipulation to debug 
something 😆 



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