squah-confluent commented on code in PR #18934:
URL: https://github.com/apache/kafka/pull/18934#discussion_r1958519491


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coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/CoordinatorRuntimeMetrics.java:
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@@ -71,7 +71,7 @@ public interface CoordinatorRuntimeMetrics extends 
AutoCloseable {
      * Record the thread idle time.
      * @param idleTimeMs The idle time in milliseconds.
      */
-    void recordThreadIdleTime(long idleTimeMs);
+    void recordThreadIdleTime(double idleTimeMs);

Review Comment:
   It looks a bit strange to have this particular metric accept a double while 
all the other metrics accept a long.
   
   But I don't think we should change the other metrics to accept doubles, 
since they're strictly durations. This one is a little different and normalized 
by the number of threads.



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