diff --git a/apps/metrics/src/main/java/org/onosproject/metrics/intent/IntentMetrics.java b/apps/metrics/src/main/java/org/onosproject/metrics/intent/IntentMetrics.java
index b1d9188..8fa618a 100644
--- a/apps/metrics/src/main/java/org/onosproject/metrics/intent/IntentMetrics.java
+++ b/apps/metrics/src/main/java/org/onosproject/metrics/intent/IntentMetrics.java
@@ -15,18 +15,7 @@
  */
 package org.onosproject.metrics.intent;
 
-import static org.slf4j.LoggerFactory.getLogger;
-
-import java.util.LinkedList;
-import java.util.List;
-
 import com.google.common.collect.ImmutableList;
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
 import org.onlab.metrics.EventMetric;
 import org.onlab.metrics.MetricsService;
 import org.onosproject.core.ApplicationId;
@@ -34,24 +23,33 @@
 import org.onosproject.net.intent.IntentEvent;
 import org.onosproject.net.intent.IntentListener;
 import org.onosproject.net.intent.IntentService;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 
+import java.util.LinkedList;
+import java.util.List;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
 /**
  * ONOS Intent Metrics Application that collects intent-related metrics.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = { IntentMetricsService.class, IntentListener.class })
 public class IntentMetrics implements IntentMetricsService,
                                       IntentListener {
     private static final Logger log = getLogger(IntentMetrics.class);
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected IntentService intentService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MetricsService metricsService;
 
     private ApplicationId appId;
diff --git a/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetrics.java b/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetrics.java
index 1850ed8..77d8d5e 100644
--- a/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetrics.java
+++ b/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetrics.java
@@ -15,18 +15,7 @@
  */
 package org.onosproject.metrics.topology;
 
-import static org.slf4j.LoggerFactory.getLogger;
-
-import java.util.LinkedList;
-import java.util.List;
-
 import com.google.common.collect.ImmutableList;
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
 import org.onlab.metrics.EventMetric;
 import org.onlab.metrics.MetricsService;
 import org.onosproject.core.ApplicationId;
@@ -44,32 +33,41 @@
 import org.onosproject.net.topology.TopologyEvent;
 import org.onosproject.net.topology.TopologyListener;
 import org.onosproject.net.topology.TopologyService;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 
+import java.util.LinkedList;
+import java.util.List;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
 /**
  * ONOS Topology Metrics Application that collects topology-related metrics.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = TopologyMetricsService.class)
 public class TopologyMetrics implements TopologyMetricsService {
     private static final Logger log = getLogger(TopologyMetrics.class);
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceService deviceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected HostService hostService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected LinkService linkService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MetricsService metricsService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected TopologyService topologyService;
 
     private ApplicationId appId;