chia7712 commented on code in PR #15722:
URL: https://github.com/apache/kafka/pull/15722#discussion_r1573465932


##########
clients/src/test/java/org/apache/kafka/common/network/SelectorTest.java:
##########
@@ -1012,6 +1013,28 @@ public void testChannelCloseWhileProcessingReceives() 
throws Exception {
         assertEquals(0, selector.completedReceives().size());
     }
 
+    /**
+     * Validate that correct subset of io metrics marked deprecated in docs
+     */
+    @Test
+    public void testIoMetricsHaveCorrectDoc() {
+        List<String> actual = asList("io-ratio", "io-wait-ratio");
+        List<String> deprecated = asList("iotime-total", "io-waittime-total");
+
+        // iterate through all metrics, since metrics.metric(metricName) 
requires 
+        // knowing metric group and tag set, which are not trivial dependencies
+        for (MetricName metricName : metrics.metrics().keySet()) {

Review Comment:
   For example:
   ```java
           assertEquals(actual.size(), metrics.metrics().keySet().stream()
               .filter(m -> actual.contains(m.name()))
               .filter(m -> 
!m.description().toLowerCase(Locale.ROOT).contains("deprecated"))
               .count());
   
           assertEquals(deprecated.size(), metrics.metrics().keySet().stream()
               .filter(m -> deprecated.contains(m.name()))
               .filter(m -> 
m.description().toLowerCase(Locale.ROOT).contains("deprecated"))
               .count());
   ```
   
   



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