diff --git a/apm-agent-core/src/main/java/co/elastic/apm/agent/report/serialize/DslJsonDataWriter.java b/apm-agent-core/src/main/java/co/elastic/apm/agent/report/serialize/DslJsonDataWriter.java
index af2f3f6b3f..dd76658a92 100644
--- a/apm-agent-core/src/main/java/co/elastic/apm/agent/report/serialize/DslJsonDataWriter.java
+++ b/apm-agent-core/src/main/java/co/elastic/apm/agent/report/serialize/DslJsonDataWriter.java
@@ -117,4 +117,9 @@ public int size() {
     public void report() {
         reporter.reportMetrics(jw);
     }
+
+    @Override
+    public String toString() {
+        return jw.toString();
+    }
 }
diff --git a/apm-agent-plugins/apm-micrometer-plugin/src/test/java/co/elastic/apm/agent/micrometer/MicrometerMeterRegistrySerializerTest.java b/apm-agent-plugins/apm-micrometer-plugin/src/test/java/co/elastic/apm/agent/micrometer/MicrometerMeterRegistrySerializerTest.java
index 5481763853..f47dc58f5b 100644
--- a/apm-agent-plugins/apm-micrometer-plugin/src/test/java/co/elastic/apm/agent/micrometer/MicrometerMeterRegistrySerializerTest.java
+++ b/apm-agent-plugins/apm-micrometer-plugin/src/test/java/co/elastic/apm/agent/micrometer/MicrometerMeterRegistrySerializerTest.java
@@ -65,8 +65,8 @@ static void setup() {
         when(tracer.newWriter(anyInt())).thenAnswer(new Answer<DataWriter>() {
             @Override
             public DataWriter answer(InvocationOnMock invocationOnMock) {
-                int size = invocationOnMock.getArgument(0);
-                return new DslJsonDataWriter(dslJson.newWriter(size), reporter);
+                int maxSerializedSize = invocationOnMock.getArgument(0);
+                return new DslJsonDataWriter(dslJson.newWriter(maxSerializedSize), reporter);
             }
         });
         serializer = new MicrometerMeterRegistrySerializer(config, tracer);