OSGi property annotations for ganglia metrics app

Change-Id: If326fce501bb701e8dc34dcbb2ad1a17c7fc8978
diff --git a/apps/gangliametrics/src/main/java/org/onosproject/gangliametrics/OsgiPropertyConstants.java b/apps/gangliametrics/src/main/java/org/onosproject/gangliametrics/OsgiPropertyConstants.java
new file mode 100644
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--- /dev/null
+++ b/apps/gangliametrics/src/main/java/org/onosproject/gangliametrics/OsgiPropertyConstants.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2018-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.onosproject.gangliametrics;
+
+public final class OsgiPropertyConstants {
+    private OsgiPropertyConstants() {
+    }
+
+    static final String MONITOR_ALL = "monitorAll";
+    static final boolean MONITOR_ALL_DEFAULT = true;
+
+    static final String METRIC_NAMES = "metricNames";
+    static final String METRIC_NAMES_DEFAULT = "default";
+
+    static final String ADDRESS = "address";
+    static final String ADDRESS_DEFAULT = "localhost";
+
+    static final String PORT = "port";
+    static final int PORT_DEFAULT = 8649;
+
+    static final String TTL = "ttl";
+    static final int TTL_DEFAULT = 1;
+}