add database monitor all group

cat-home/src/main/java/com/dianping/cat/report/page/database/Handler.java

@@ -83,10 +83,6 @@ public class Handler implements PageHandler<Context> {
 			}
 		}
 		
-		if(StringUtils.isEmpty(payload.getGroup())){
-			payload.setGroup(DatabaseGroup.KEY_GROUPS.keySet().iterator().next());
-		}
-
 		int timeRange = payload.getTimeRange();
 		Date startTime = new Date(payload.getDate() - (timeRange - 1) * TimeHelper.ONE_HOUR);
 		Date endTime = new Date(payload.getDate() + TimeHelper.ONE_HOUR - 1);

cat-home/src/main/webapp/jsp/report/database/database.jsp

@@ -31,6 +31,7 @@
 						</span>
 						<span class="input-group-btn" style="width:125px;">
 							<select class="form-control" id="group" style="width:120px;height:34px">
+								<option value=''>All</option>
 								<c:forEach var="item" items="${model.groups}" varStatus="status">
 									<option value='${item}'>${item}</option>
 								</c:forEach>

cat-home/src/test/java/com/dianping/cat/demo/MetricMonitorTest.java

@@ -11,7 +11,7 @@ public class MetricMonitorTest {
 
 	@Test
 	public void test() throws Exception {
-		String host = "localhost:2281";
+		String host = "cat.qa.dianpingoa.com";
 		String group = "db-mysql-tg01s6.nh[10.1.1.136]";
 		for (int i = 0; i < 1000; i++) {
 			SendData(host, group, "Load", 100);