diff --git a/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java b/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java
new file mode 100644
index 0000000..fb0bf8b
--- /dev/null
+++ b/apps/cpman/app/src/main/java/org/onosproject/cpman/impl/ControlMetricsObserver.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2015-2016 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.cpman.impl;
+
+import org.onosproject.net.DeviceId;
+
+import java.util.Optional;
+
+/**
+ * Control metrics observer interface.
+ */
+public interface ControlMetricsObserver {
+
+    /**
+     * Feeds the extracted value from MetricAggregator to back-end storage.
+     *
+     * @param metricsAggregator metric aggregator
+     * @param deviceId          device id {@link org.onosproject.net.DeviceId}
+     */
+    void feedMetrics(MetricsAggregator metricsAggregator, Optional<DeviceId> deviceId);
+
+    /**
+     * Feeds the extracted value from MetricAggregator to back-end storage.
+     *
+     * @param metricsAggregator metric aggregator
+     * @param resourceName      resource name
+     */
+    void feedMetrics(MetricsAggregator metricsAggregator, String resourceName);
+}