Added Kafka metrics for CDS workers

Added counters to gather metrics on CDS Kafka workers.
This will enable us to get metrics on how many messages we consumer and produce to/from kafka.
For consumers we count how many messages we consume and how many failed ie. consumed but not able to be processed (parsing error).
For producers we count how many messages we produce and how many failed ie. failed to be pushed to the cluster (unavailable brokers, network error, ...).
Relocated metrics tag constants to BlueprintConstants so that they can be use by any CDS module.
If they make sense for other metrics then they should be shared.

Issue-ID: CCSDK-3155
Signed-off-by: Julien Fontaine <julien.fontaine@bell.ca>
Change-Id: Iad6aba588766f655f3a74cd626e0f74e29188f96

9 files changed, 156 insertions, 12 deletions

diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/BlueprintMessageMetricConstants.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/BlueprintMessageMetricConstants.kt
new file mode 100644
index 000000000..be84f479f
--- /dev/null
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/BlueprintMessageMetricConstants.kt
@@ -0,0 +1,32 @@
+/*
+ * Copyright © 2021 Bell Canada.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onap.ccsdk.cds.blueprintsprocessor.message
+
+object BlueprintMessageMetricConstants {
+
+    private const val METRIC_PREFIX = "cds.kafka"
+
+    private const val PRODUCED_MESSAGES_PREFIX = "$METRIC_PREFIX.produced.messages"
+    private const val CONSUMED_MESSAGES_PREFIX = "$METRIC_PREFIX.consumed.messages"
+
+    // COUNTERS
+    const val KAFKA_PRODUCED_MESSAGES_COUNTER = "$PRODUCED_MESSAGES_PREFIX.total"
+    const val KAFKA_PRODUCED_MESSAGES_ERROR_COUNTER = "$PRODUCED_MESSAGES_PREFIX.error"
+
+    const val KAFKA_CONSUMED_MESSAGES_COUNTER = "$CONSUMED_MESSAGES_PREFIX.total"
+    const val KAFKA_CONSUMED_MESSAGES_ERROR_COUNTER = "$CONSUMED_MESSAGES_PREFIX.error"
+}
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageLibPropertyService.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageLibPropertyService.kt
index 9e0c537cf..cb0bc3225 100644
--- a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageLibPropertyService.kt
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageLibPropertyService.kt
@@ -1,6 +1,6 @@
 /*
  *  Copyright © 2019 IBM.
- *  Modifications Copyright © 2018-2019 AT&T Intellectual Property.
+ *  Modifications Copyright © 2018-2021 AT&T, Bell Canada Intellectual Property
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@
 package org.onap.ccsdk.cds.blueprintsprocessor.message.service
 
 import com.fasterxml.jackson.databind.JsonNode
+import io.micrometer.core.instrument.MeterRegistry
 import org.onap.ccsdk.cds.blueprintsprocessor.core.BlueprintPropertiesService
 import org.onap.ccsdk.cds.blueprintsprocessor.message.KafkaBasicAuthMessageConsumerProperties
 import org.onap.ccsdk.cds.blueprintsprocessor.message.KafkaBasicAuthMessageProducerProperties
@@ -36,17 +37,20 @@ import org.onap.ccsdk.cds.controllerblueprints.core.utils.JacksonUtils
 import org.springframework.stereotype.Service
 
 @Service(MessageLibConstants.SERVICE_BLUEPRINT_MESSAGE_LIB_PROPERTY)
-open class BlueprintMessageLibPropertyService(private var bluePrintPropertiesService: BlueprintPropertiesService) {
+open class BlueprintMessageLibPropertyService(
+    private var bluePrintPropertiesService: BlueprintPropertiesService,
+    private val meterRegistry: MeterRegistry
+) {
 
     fun blueprintMessageProducerService(jsonNode: JsonNode): BlueprintMessageProducerService {
         val messageClientProperties = messageProducerProperties(jsonNode)
-        return KafkaMessageProducerService(messageClientProperties)
+        return KafkaMessageProducerService(messageClientProperties, meterRegistry)
     }
 
     fun blueprintMessageProducerService(selector: String): BlueprintMessageProducerService {
         val prefix = "${MessageLibConstants.PROPERTY_MESSAGE_PRODUCER_PREFIX}$selector"
         val messageClientProperties = messageProducerProperties(prefix)
-        return KafkaMessageProducerService(messageClientProperties)
+        return KafkaMessageProducerService(messageClientProperties, meterRegistry)
     }
 
     fun messageProducerProperties(prefix: String): MessageProducerProperties {
@@ -184,17 +188,20 @@ open class BlueprintMessageLibPropertyService(private var bluePrintPropertiesSer
                 /** Message Consumer */
                 MessageLibConstants.TYPE_KAFKA_BASIC_AUTH -> {
                     return KafkaMessageConsumerService(
-                        messageConsumerProperties as KafkaBasicAuthMessageConsumerProperties
+                        messageConsumerProperties as KafkaBasicAuthMessageConsumerProperties,
+                        meterRegistry
                     )
                 }
                 MessageLibConstants.TYPE_KAFKA_SSL_AUTH -> {
                     return KafkaMessageConsumerService(
-                        messageConsumerProperties as KafkaSslAuthMessageConsumerProperties
+                        messageConsumerProperties as KafkaSslAuthMessageConsumerProperties,
+                        meterRegistry
                     )
                 }
                 MessageLibConstants.TYPE_KAFKA_SCRAM_SSL_AUTH -> {
                     return KafkaMessageConsumerService(
-                        messageConsumerProperties as KafkaScramSslAuthMessageConsumerProperties
+                        messageConsumerProperties as KafkaScramSslAuthMessageConsumerProperties,
+                        meterRegistry
                     )
                 }
                 /** Stream Consumer */
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageConsumerService.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageConsumerService.kt
index af689a1f2..004b476b8 100644
--- a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageConsumerService.kt
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageConsumerService.kt
@@ -17,6 +17,7 @@
 
 package org.onap.ccsdk.cds.blueprintsprocessor.message.service
 
+import io.micrometer.core.instrument.MeterRegistry
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -24,13 +25,16 @@ import kotlinx.coroutines.runBlocking
 import org.apache.kafka.clients.consumer.Consumer
 import org.apache.kafka.clients.consumer.ConsumerRecord
 import org.apache.kafka.clients.consumer.KafkaConsumer
+import org.onap.ccsdk.cds.blueprintsprocessor.message.BlueprintMessageMetricConstants
 import org.onap.ccsdk.cds.blueprintsprocessor.message.KafkaBasicAuthMessageConsumerProperties
+import org.onap.ccsdk.cds.blueprintsprocessor.message.utils.BlueprintMessageUtils
 import org.onap.ccsdk.cds.controllerblueprints.core.logger
 import java.time.Duration
 import kotlin.concurrent.thread
 
 open class KafkaMessageConsumerService(
-    private val messageConsumerProperties: KafkaBasicAuthMessageConsumerProperties
+    private val messageConsumerProperties: KafkaBasicAuthMessageConsumerProperties,
+    private val meterRegistry: MeterRegistry
 ) :
     BlueprintMessageConsumerService {
 
@@ -78,6 +82,10 @@ open class KafkaMessageConsumerService(
                     runBlocking {
                         consumerRecords?.forEach { consumerRecord ->
                             launch {
+                                meterRegistry.counter(
+                                    BlueprintMessageMetricConstants.KAFKA_CONSUMED_MESSAGES_COUNTER,
+                                    BlueprintMessageUtils.kafkaMetricTag(consumerRecord.topic())
+                                ).increment()
                                 /** execute the command block */
                                 if (!channel.isClosedForSend) {
                                     channel.send(consumerRecord)
@@ -89,6 +97,10 @@ open class KafkaMessageConsumerService(
                                             "key(${consumerRecord.key()})"
                                     )
                                 } else {
+                                    meterRegistry.counter(
+                                        BlueprintMessageMetricConstants.KAFKA_CONSUMED_MESSAGES_ERROR_COUNTER,
+                                        BlueprintMessageUtils.kafkaMetricTag(consumerRecord.topic())
+                                    ).increment()
                                     log.error("Channel is closed to receive message")
                                 }
                             }
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageProducerService.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageProducerService.kt
index 88b0dfaae..21fd84d11 100644
--- a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageProducerService.kt
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaMessageProducerService.kt
@@ -18,6 +18,7 @@
 package org.onap.ccsdk.cds.blueprintsprocessor.message.service
 
 import com.fasterxml.jackson.databind.node.ObjectNode
+import io.micrometer.core.instrument.MeterRegistry
 import org.apache.commons.lang.builder.ToStringBuilder
 import org.apache.kafka.clients.producer.Callback
 import org.apache.kafka.clients.producer.KafkaProducer
@@ -26,14 +27,17 @@ import org.apache.kafka.common.header.internals.RecordHeader
 import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.ExecutionServiceInput
 import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.ExecutionServiceOutput
 import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.Status
+import org.onap.ccsdk.cds.blueprintsprocessor.message.BlueprintMessageMetricConstants
 import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageProducerProperties
+import org.onap.ccsdk.cds.blueprintsprocessor.message.utils.BlueprintMessageUtils
 import org.onap.ccsdk.cds.controllerblueprints.core.asJsonPrimitive
 import org.onap.ccsdk.cds.controllerblueprints.core.asJsonString
 import org.slf4j.LoggerFactory
 import java.nio.charset.Charset
 
 class KafkaMessageProducerService(
-    private val messageProducerProperties: MessageProducerProperties
+    private val messageProducerProperties: MessageProducerProperties,
+    private val meterRegistry: MeterRegistry
 ) :
     BlueprintMessageProducerService {
 
@@ -76,9 +80,17 @@ class KafkaMessageProducerService(
             headers.forEach { (key, value) -> recordHeaders.add(RecordHeader(key, value.toByteArray())) }
         }
         val callback = Callback { metadata, exception ->
-            if (exception != null)
+            meterRegistry.counter(
+                BlueprintMessageMetricConstants.KAFKA_PRODUCED_MESSAGES_COUNTER,
+                BlueprintMessageUtils.kafkaMetricTag(topic)
+            ).increment()
+            if (exception != null) {
+                meterRegistry.counter(
+                    BlueprintMessageMetricConstants.KAFKA_PRODUCED_MESSAGES_ERROR_COUNTER,
+                    BlueprintMessageUtils.kafkaMetricTag(topic)
+                ).increment()
                 log.error("Couldn't publish ${clonedMessage::class.simpleName} ${getMessageLogData(clonedMessage)}.", exception)
-            else {
+            } else {
                 val message = "${clonedMessage::class.simpleName} published : topic(${metadata.topic()}) " +
                     "partition(${metadata.partition()}) " +
                     "offset(${metadata.offset()}) ${getMessageLogData(clonedMessage)}."
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/utils/BlueprintMessageUtils.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/utils/BlueprintMessageUtils.kt
new file mode 100644
index 000000000..7431998d9
--- /dev/null
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/utils/BlueprintMessageUtils.kt
@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2021 Bell Canada.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onap.ccsdk.cds.blueprintsprocessor.message.utils
+
+import io.micrometer.core.instrument.Tag
+import org.onap.ccsdk.cds.controllerblueprints.core.BlueprintConstants
+
+class BlueprintMessageUtils {
+    companion object {
+        fun kafkaMetricTag(topic: String): MutableList<Tag> =
+            mutableListOf(
+                Tag.of(BlueprintConstants.METRIC_TAG_TOPIC, topic)
+            )
+    }
+}
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageConsumerServiceTest.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageConsumerServiceTest.kt
index f240f76c0..fb53ff45b 100644
--- a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageConsumerServiceTest.kt
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageConsumerServiceTest.kt
@@ -1,6 +1,6 @@
 /*
  *  Copyright © 2019 IBM.
- *  Modifications Copyright © 2018-2019 AT&T Intellectual Property.
+ *  Modifications Copyright © 2018-2021 AT&T, Bell Canada Intellectual Property.
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 
 package org.onap.ccsdk.cds.blueprintsprocessor.message.service
 
+import io.micrometer.core.instrument.MeterRegistry
 import io.mockk.every
 import io.mockk.spyk
 import kotlinx.coroutines.channels.consumeEach
@@ -47,6 +48,7 @@ import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageConsumerProperties
 import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageLibConstants
 import org.onap.ccsdk.cds.controllerblueprints.core.logger
 import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.mock.mockito.MockBean
 import org.springframework.test.annotation.DirtiesContext
 import org.springframework.test.context.ContextConfiguration
 import org.springframework.test.context.TestPropertySource
@@ -100,6 +102,9 @@ open class BlueprintMessageConsumerServiceTest {
     @Autowired
     lateinit var bluePrintMessageLibPropertyService: BlueprintMessageLibPropertyService
 
+    @MockBean
+    lateinit var meterRegistry: MeterRegistry
+
     @Test
     fun testKafkaBasicAuthConsumerService() {
         runBlocking {
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageProducerServiceTest.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageProducerServiceTest.kt
index 2293ceec3..1490a3311 100644
--- a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageProducerServiceTest.kt
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/BlueprintMessageProducerServiceTest.kt
@@ -1,5 +1,6 @@
 /*
  *  Copyright © 2019 IBM.
+ *  Modifications Copyright © 2021 Bell Canada.
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -16,6 +17,7 @@
 
 package org.onap.ccsdk.cds.blueprintsprocessor.message.service
 
+import io.micrometer.core.instrument.MeterRegistry
 import io.mockk.every
 import io.mockk.mockk
 import io.mockk.spyk
@@ -37,6 +39,7 @@ import org.onap.ccsdk.cds.blueprintsprocessor.core.BlueprintPropertyConfiguratio
 import org.onap.ccsdk.cds.blueprintsprocessor.message.BlueprintMessageLibConfiguration
 import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageLibConstants
 import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.mock.mockito.MockBean
 import org.springframework.test.annotation.DirtiesContext
 import org.springframework.test.context.ContextConfiguration
 import org.springframework.test.context.TestPropertySource
@@ -74,6 +77,9 @@ open class BlueprintMessageProducerServiceTest {
     @Autowired
     lateinit var bluePrintMessageLibPropertyService: BlueprintMessageLibPropertyService
 
+    @MockBean
+    lateinit var meterRegistry: MeterRegistry
+
     @Test
     fun testKafkaScramSslAuthProducerService() {
         runBlocking {
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaStreamsConsumerServiceTest.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaStreamsConsumerServiceTest.kt
index 70968ef0c..b93cd42d4 100644
--- a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaStreamsConsumerServiceTest.kt
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/service/KafkaStreamsConsumerServiceTest.kt
@@ -1,5 +1,6 @@
 /*
  * Copyright © 2018-2019 AT&T Intellectual Property.
+ * Modifications Copyright © 2021 Bell Canada.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +17,7 @@
 
 package org.onap.ccsdk.cds.blueprintsprocessor.message.service
 
+import io.micrometer.core.instrument.MeterRegistry
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
@@ -32,6 +34,7 @@ import org.onap.ccsdk.cds.blueprintsprocessor.message.BlueprintMessageLibConfigu
 import org.onap.ccsdk.cds.blueprintsprocessor.message.KafkaStreamsBasicAuthConsumerProperties
 import org.onap.ccsdk.cds.blueprintsprocessor.message.MessageConsumerProperties
 import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.mock.mockito.MockBean
 import org.springframework.test.annotation.DirtiesContext
 import org.springframework.test.context.ContextConfiguration
 import org.springframework.test.context.TestPropertySource
@@ -74,6 +77,9 @@ class KafkaStreamsConsumerServiceTest {
     @Autowired
     lateinit var bluePrintMessageLibPropertyService: BlueprintMessageLibPropertyService
 
+    @MockBean
+    lateinit var meterRegistry: MeterRegistry
+
     @Test
     fun testProperties() {
         val blueprintMessageConsumerService = bluePrintMessageLibPropertyService.blueprintMessageConsumerService("stream-consumer")
diff --git a/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/utils/BlueprintMessageUtilsTest.kt b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/utils/BlueprintMessageUtilsTest.kt
new file mode 100644
index 000000000..849a411a6
--- /dev/null
+++ b/ms/blueprintsprocessor/modules/commons/message-lib/src/test/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/message/utils/BlueprintMessageUtilsTest.kt
@@ -0,0 +1,35 @@
+/*
+ * Copyright © 2021 Bell Canada.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onap.ccsdk.cds.blueprintsprocessor.message.utils
+
+import io.micrometer.core.instrument.Tag
+import org.junit.Test
+import org.onap.ccsdk.cds.controllerblueprints.core.BlueprintConstants
+import kotlin.test.assertEquals
+
+class BlueprintMessageUtilsTest {
+
+    @Test
+    fun testKafkaMetricTag() {
+        val expected = mutableListOf<Tag>(
+            Tag.of(BlueprintConstants.METRIC_TAG_TOPIC, "my-topic")
+        )
+        val tags = BlueprintMessageUtils.kafkaMetricTag("my-topic")
+
+        assertEquals(expected, tags)
+    }
+}