diff --git a/checkstyle/suppressions.xml b/checkstyle/suppressions.xml
index a53a50a75fcd3..09c87da1e4833 100644
--- a/checkstyle/suppressions.xml
+++ b/checkstyle/suppressions.xml
@@ -133,7 +133,7 @@
               files="(JsonConverter|Values|ConnectHeaders).java"/>
 
     <suppress checks="JavaNCSS"
-              files="(KafkaConfigBackingStore|Values).java"/>
+              files="(KafkaConfigBackingStore|Values|ConnectMetricsRegistry).java"/>
 
     <suppress checks="NPathComplexity"
               files="(DistributedHerder|RestClient|RestServer|JsonConverter|KafkaConfigBackingStore|FileStreamSourceTask|TopicAdmin).java"/>
diff --git a/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/ConnectMetricsRegistry.java b/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/ConnectMetricsRegistry.java
index cf567450fe2a0..f301439da8356 100644
--- a/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/ConnectMetricsRegistry.java
+++ b/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/ConnectMetricsRegistry.java
@@ -112,6 +112,9 @@ public class ConnectMetricsRegistry {
     public final MetricNameTemplate dlqProduceRequests;
     public final MetricNameTemplate dlqProduceFailures;
     public final MetricNameTemplate lastErrorTimestamp;
+    public final MetricNameTemplate transactionSizeMin;
+    public final MetricNameTemplate transactionSizeMax;
+    public final MetricNameTemplate transactionSizeAvg;
 
     public Map<MetricNameTemplate, TaskStatus.State> connectorStatusMetrics;
 
@@ -207,6 +210,16 @@ public ConnectMetricsRegistry(Set<String> tags) {
                                                     "completely written to Kafka.",
                                                     sourceTaskTags);
 
+        transactionSizeMin = createTemplate("transaction-size-min", SOURCE_TASK_GROUP_NAME,
+                                            "The number of records in the smallest transaction the task has committed so far. ",
+                                            sourceTaskTags);
+        transactionSizeMax = createTemplate("transaction-size-max", SOURCE_TASK_GROUP_NAME,
+                                            "The number of records in the largest transaction the task has committed so far.",
+                                            sourceTaskTags);
+        transactionSizeAvg = createTemplate("transaction-size-avg", SOURCE_TASK_GROUP_NAME,
+                                            "The average number of records in the transactions the task has committed so far.",
+                                            sourceTaskTags);
+
         /***** Sink worker task level *****/
         Set<String> sinkTaskTags = new LinkedHashSet<>(tags);
         sinkTaskTags.add(CONNECTOR_TAG_NAME);