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diff --git a/framework/src/onos/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetricsService.java b/framework/src/onos/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetricsService.java
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+++ b/framework/src/onos/apps/metrics/src/main/java/org/onosproject/metrics/topology/TopologyMetricsService.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * 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.onosproject.metrics.topology;
+
+import java.util.List;
+import org.onlab.metrics.EventMetric;
+import org.onosproject.event.Event;
+
+/**
+ * Service interface exported by TopologyMetrics.
+ */
+public interface TopologyMetricsService {
+    /**
+     * Gets the last saved topology events.
+     *
+     * @return the last saved topology events
+     */
+    List<Event> getEvents();
+
+    /**
+     * Gets the Event Metric for the Device Events.
+     *
+     * @return the Event Metric for the Device Events
+     */
+    EventMetric topologyDeviceEventMetric();
+
+    /**
+     * Gets the Event Metric for the Host Events.
+     *
+     * @return the Event Metric for the Host Events
+     */
+    EventMetric topologyHostEventMetric();
+
+    /**
+     * Gets the Event Metric for the Link Events.
+     *
+     * @return the Event Metric for the Link Events
+     */
+    EventMetric topologyLinkEventMetric();
+
+    /**
+     * Gets the Event Metric for the Topology Graph Events.
+     *
+     * @return the Event Metric for the Topology Graph Events
+     */
+    EventMetric topologyGraphEventMetric();
+
+    /**
+     * Gets the Event Metric for the Topology Graph Reasons Events.
+     *
+     * @return the Event Metric for the Topology Graph Reasons Events
+     */
+    EventMetric topologyGraphReasonsEventMetric();
+}