AndrewJSchofield commented on code in PR #18174:
URL: https://github.com/apache/kafka/pull/18174#discussion_r1922553367


##########
share-coordinator/src/main/java/org/apache/kafka/coordinator/share/metrics/ShareCoordinatorMetrics.java:
##########
@@ -153,4 +158,31 @@ public void record(String sensorName) {
             globalSensors.get(sensorName).record();
         }
     }
+
+    public void recordPrune(double value, TopicPartition tp) {
+        pruneMetrics.computeIfAbsent(tp, k -> new ShareGroupPruneMetrics(tp))
+            .pruneSensor.record(value);
+    }
+
+    private class ShareGroupPruneMetrics {
+        private final Sensor pruneSensor;
+
+        ShareGroupPruneMetrics(TopicPartition tp) {
+            String sensorNameSuffix = tp.toString();
+            Map<String, String> tags = Map.of(
+                "topic", tp.topic(),
+                "partition", Integer.toString(tp.partition())
+            );
+
+            pruneSensor = 
metrics.sensor(SHARE_COORDINATOR_STATE_TOPIC_PRUNE_SENSOR_NAME + 
sensorNameSuffix);
+
+            pruneSensor.add(
+                metrics.metricName("last-pruned-offset",

Review Comment:
   I think perhaps the values will match in general. However, I think it's 
helpful to have this metric in the share-coordinator group.



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