Aggregate stats from all cluster nodes and publish

Change-Id: Ic41cdcc8fc17845dabffc42b817b8bb7439a0b52
diff --git a/app/src/main/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCounterNames.java b/app/src/main/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCounterNames.java
new file mode 100644
index 0000000..8c2b694
--- /dev/null
+++ b/app/src/main/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCounterNames.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.opencord.dhcpl2relay.impl;
+
+import com.google.common.collect.ImmutableSet;
+
+import java.util.Set;
+
+/**
+ * Represents DHCP relay counters type.
+ */
+public enum DhcpL2RelayCounterNames {
+    /**
+     *  DHCP relay counter of type Discover.
+     */
+    DHCPDISCOVER,
+    /**
+     *  DHCP relay counter of type Release.
+     */
+    DHCPRELEASE,
+    /**
+     *  DHCP relay counter of type Decline.
+     */
+    DHCPDECLINE,
+    /**
+     *  DHCP relay counter of type Request.
+     */
+    DHCPREQUEST,
+    /**
+     *  DHCP relay counter of type Offer.
+     */
+    DHCPOFFER,
+    /**
+     *  DHCP relay counter of type ACK.
+     */
+    DHCPACK,
+    /**
+     *  DHCP relay counter of type NACK.
+     */
+    DHCPNACK,
+    /**
+     *  DHCP relay counter of type Packets_to_server.
+     */
+    PACKETS_TO_SERVER,
+    /**
+     *  DHCP relay counter of type Packets_from_server.
+     */
+    PACKETS_FROM_SERVER;
+
+    /**
+     * Supported types of DHCP relay counters.
+     */
+    static final Set<DhcpL2RelayCounterNames> SUPPORTED_COUNTERS = ImmutableSet.of(DhcpL2RelayCounterNames.DHCPDISCOVER,
+            DhcpL2RelayCounterNames.DHCPRELEASE, DhcpL2RelayCounterNames.DHCPDECLINE,
+            DhcpL2RelayCounterNames.DHCPREQUEST, DhcpL2RelayCounterNames.DHCPOFFER,
+            DhcpL2RelayCounterNames.DHCPACK, DhcpL2RelayCounterNames.DHCPNACK,
+            DhcpL2RelayCounterNames.PACKETS_TO_SERVER,
+            DhcpL2RelayCounterNames.PACKETS_FROM_SERVER);
+    }
\ No newline at end of file