diff --git a/README.md b/README.md
index 16e20792..a78341d4 100644
--- a/README.md
+++ b/README.md
@@ -100,15 +100,6 @@ Since this is an open source tool, please comply with the relevant laws and regu
 
 [Kafka Eagle Architecture PDF](http://www.kafka-eagle.org/articles/docs/architecture/pdf.html)
 
-<!--
-# Donation
-If this project help you reduce time to develop, you can give me a cup of coffee.
-
-[![](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/paypalme/KafkaEagle)
-[![](https://img.shields.io/badge/Donate-WeChat-green.svg)](http://www.kafka-eagle.org/articles/donate/pay.html)
-[![](https://img.shields.io/badge/Donate-Alipay-green.svg)](http://www.kafka-eagle.org/articles/donate/pay.html)
--->
-
 # Contributors
 
 Thanks to the following members for maintaining the project. If this project help you reduce time to develop, you can give us a star. 
diff --git a/kafka-eagle-web/src/main/webapp/WEB-INF/views/alarm/add.jsp b/kafka-eagle-web/src/main/webapp/WEB-INF/views/alarm/add.jsp
index bca4a073..ae46f64c 100644
--- a/kafka-eagle-web/src/main/webapp/WEB-INF/views/alarm/add.jsp
+++ b/kafka-eagle-web/src/main/webapp/WEB-INF/views/alarm/add.jsp
@@ -1,161 +1,187 @@
 <%@ page language="java" contentType="text/html; charset=UTF-8"
-	pageEncoding="UTF-8"%>
-<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
+         pageEncoding="UTF-8" %>
+<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 
 <!DOCTYPE html>
 <html lang="zh">
 
 <head>
-<meta charset="utf-8">
-<meta http-equiv="X-UA-Compatible" content="IE=edge">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="description" content="">
-<meta name="author" content="">
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="description" content="">
+    <meta name="author" content="">
 
-<title>Alarm - KafkaEagle</title>
-<jsp:include page="../public/plus/css.jsp">
-	<jsp:param value="plugins/select2/select2.min.css" name="css" />
-</jsp:include>
+    <title>Alarm - KafkaEagle</title>
+    <jsp:include page="../public/plus/css.jsp">
+        <jsp:param value="plugins/select2/select2.min.css" name="css"/>
+    </jsp:include>
 </head>
 
 <body>
 <jsp:include page="../public/plus/navtop.jsp"></jsp:include>
 <div id="layoutSidenav">
-	<div id="layoutSidenav_nav">
-		<jsp:include page="../public/plus/navbar.jsp"></jsp:include>
-	</div>
-	<div id="layoutSidenav_content">
-		<main>
-			<div class="container-fluid">
-				<h1 class="mt-4">AlarmConsumer</h1>
-				<ol class="breadcrumb mb-4">
-					<li class="breadcrumb-item"><a href="#">AlarmConsumer</a></li>
-					<li class="breadcrumb-item active">Add</li>
-				</ol>
-				<div class="alert alert-info alert-dismissable">
-					<button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
-					<i class="fas fa-info-circle"></i> <strong>Add an alarm to
-					the topic being consumed.</strong>
-				</div>
-				<!-- content body -->
-				<div class="row">
-					<div class="col-lg-12">
-						<div class="card mb-4">
-							<div class="card-header">
-								<i class="fas fa-server"></i> Consumer Setting
-							</div>
-							<div class="card-body">
-								<div class="row">
-									<div class="col-lg-12">
-										<form role="form" action="/alarm/add/form" method="post"
-											  onsubmit="return contextConsumerFormValid();return false;">
-											<div class="form-group">
-												<label>Consumer Group (*)</label> <select
-													id="select2consumergroup" name="select2consumergroup"
-													tabindex="-1"
-													style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
-												<input id="ke_alarm_consumer_group"
-													   name="ke_alarm_consumer_group" type="hidden" /><label
-													for="inputError" class="control-label text-danger"><i
-													class="fa fa-info-circle"></i> Select the consumer group you
-												need to alarm .</label>
-											</div>
-											<div class="form-group">
-												<label>Consumer Topic (*)</label>
-												<div id="div_select_consumer_topic"></div>
-												<input id="ke_alarm_consumer_topic"
-													   name="ke_alarm_consumer_topic" type="hidden" /><label
-													for="inputError" class="control-label text-danger"><i
-													class="fa fa-info-circle"></i> Select the consumer topic you
-												need to alarm .</label>
-											</div>
-											<div class="form-group">
-												<label>Lag Threshold (*)</label> <input id="ke_topic_lag"
-																						name="ke_topic_lag" class="form-control" maxlength=50
-																						value="1"> <label for="inputError"
-																										  class="control-label text-danger"><i
-													class="fa fa-info-circle"></i> Setting the lag threshold,
-												input must be numeric .</label>
-											</div>
-											<div class="form-group">
-												<label>Alarm Level (*)</label> <select id="select2level"
-																					   name="select2level" tabindex="-1"
-																					   style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
-												<input id="ke_alarm_cluster_level"
-													   name="ke_alarm_cluster_level" type="hidden" /> <label
-													for="inputError" class="control-label text-danger"><i
-													class="fa fa-info-circle"></i> Select the cluster level you
-												need to alarm .</label>
-											</div>
-											<div class="form-group">
-												<label>Alarm Max Times (*)</label> <select
-													id="select2maxtimes" name="select2maxtimes" tabindex="-1"
-													style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
-												<input id="ke_alarm_cluster_maxtimes"
-													   name="ke_alarm_cluster_maxtimes" type="hidden" /> <label
-													for="inputError" class="control-label text-danger"><i
-													class="fa fa-info-circle"></i> Select the cluster alarm max
-												times you need to alarm .</label>
-											</div>
-											<div class="form-group">
-												<label>Alarm Group (*)</label> <select id="select2group"
-																					   name="select2group" tabindex="-1"
-																					   style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
-												<input id="ke_alarm_cluster_group"
-													   name="ke_alarm_cluster_group" type="hidden" /> <label
-													for="inputError" class="control-label text-danger"><i
-													class="fa fa-info-circle"></i> Select the cluster alarm
-												group you need to alarm .</label>
-											</div>
-											<button type="submit" class="btn btn-success">Add</button>
-											<div id="alert_consumer_message" style="display: none"
-												 class="alert alert-danger">
-												<label>Oops! Please make some changes . (*) is
-													required .</label>
-											</div>
-										</form>
-									</div>
-								</div>
-							</div>
-						</div>
-					</div>
-				</div>
-			</div>
-		</main>
-		<jsp:include page="../public/plus/footer.jsp"></jsp:include>
-	</div>
+    <div id="layoutSidenav_nav">
+        <jsp:include page="../public/plus/navbar.jsp"></jsp:include>
+    </div>
+    <div id="layoutSidenav_content">
+        <main>
+            <div class="container-fluid">
+                <h1 class="mt-4">AlarmConsumer</h1>
+                <ol class="breadcrumb mb-4">
+                    <li class="breadcrumb-item"><a href="#">AlarmConsumer</a></li>
+                    <li class="breadcrumb-item active">Add</li>
+                </ol>
+                <div class="alert alert-info alert-dismissable">
+                    <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
+                    <i class="fas fa-info-circle"></i> <strong>Add an alarm to
+                    the topic being consumed.</strong>
+                </div>
+                <!-- content body -->
+                <div class="row">
+                    <div class="col-lg-12">
+                        <div class="card mb-4">
+                            <div class="card-header">
+                                <i class="fas fa-server"></i> Consumer Setting
+                            </div>
+                            <div class="card-body">
+                                <div class="row">
+                                    <div class="col-lg-12">
+                                        <form role="form" action="/alarm/add/form" method="post"
+                                              onsubmit="return contextConsumerFormValid();return false;">
+                                            <div class="form-group">
+                                                <label>Consumer Group (*)</label> <select
+                                                    id="select2consumergroup" name="select2consumergroup"
+                                                    tabindex="-1"
+                                                    style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
+                                                <input id="ke_alarm_consumer_group"
+                                                       name="ke_alarm_consumer_group" type="hidden"/><label
+                                                    for="inputError" class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Select the consumer group you
+                                                need to alarm .</label>
+                                            </div>
+                                            <div class="form-group">
+                                                <label>Consumer Topic (*)</label>
+                                                <div id="div_select_consumer_topic"></div>
+                                                <input id="ke_alarm_consumer_topic"
+                                                       name="ke_alarm_consumer_topic" type="hidden"/><label
+                                                    for="inputError" class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Select the consumer topic you
+                                                need to alarm .</label>
+                                            </div>
+                                            <div class="form-group">
+                                                <label>Lag Threshold (*)</label> <input id="ke_topic_lag"
+                                                                                        name="ke_topic_lag"
+                                                                                        class="form-control"
+                                                                                        maxlength=50
+                                                                                        value="1"> <label
+                                                    for="inputError"
+                                                    class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Setting the lag threshold,
+                                                input must be numeric .</label>
+                                            </div>
+                                            <div class="form-group">
+                                                <label>Alarm Level (*)</label> <select id="select2level"
+                                                                                       name="select2level" tabindex="-1"
+                                                                                       style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
+                                                <input id="ke_alarm_cluster_level"
+                                                       name="ke_alarm_cluster_level" type="hidden"/> <label
+                                                    for="inputError" class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Select the cluster level you
+                                                need to alarm .</label>
+                                            </div>
+                                            <!--
+                                            <div class="form-group">
+                                                <label>Alarm Crontab (*) <strong>Default</strong></label> <input
+                                                    id="ke_alarm_crontab"
+                                                    name="ke_alarm_crontab"
+                                                    class="form-control"
+                                                    maxlength=50
+                                                    value="0 */1 * * * ?"> <label
+                                                    for="inputError"
+                                                    class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Setting crontab expression, such as 0
+                                                */1 * * * ?.</label>
+                                            </div>
+                                            -->
+                                            <div class="form-group">
+                                                <label>Alarm Max Times (*)</label> <select
+                                                    id="select2maxtimes" name="select2maxtimes" tabindex="-1"
+                                                    style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
+                                                <input id="ke_alarm_cluster_maxtimes"
+                                                       name="ke_alarm_cluster_maxtimes" type="hidden"/> <label
+                                                    for="inputError" class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Select the cluster alarm max
+                                                times you need to alarm .</label>
+                                            </div>
+                                            <div class="form-group">
+                                                <label>Alarm Group (*)</label> <select id="select2group"
+                                                                                       name="select2group" tabindex="-1"
+                                                                                       style="width: 100%; font-family: 'Microsoft Yahei', 'HelveticaNeue', Helvetica, Arial, sans-serif; font-size: 1px;"></select>
+                                                <input id="ke_alarm_cluster_group"
+                                                       name="ke_alarm_cluster_group" type="hidden"/> <label
+                                                    for="inputError" class="control-label text-danger"><i
+                                                    class="fa fa-info-circle"></i> Select the cluster alarm
+                                                group you need to alarm .</label>
+                                            </div>
+                                            <button type="submit" class="btn btn-success">Add</button>
+                                            <div id="alert_consumer_message" style="display: none"
+                                                 class="alert alert-danger">
+                                                <label>Oops! Please make some changes . (*) is
+                                                    required .</label>
+                                            </div>
+                                        </form>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </main>
+        <jsp:include page="../public/plus/footer.jsp"></jsp:include>
+    </div>
 </div>
 </body>
 <jsp:include page="../public/plus/script.jsp">
-	<jsp:param value="main/alarm/add.js" name="loader" />
-	<jsp:param value="plugins/select2/select2.min.js" name="loader" />
+    <jsp:param value="main/alarm/add.js" name="loader"/>
+    <jsp:param value="plugins/select2/select2.min.js" name="loader"/>
 </jsp:include>
 <script type="text/javascript">
-	function contextConsumerFormValid() {
-		var ke_alarm_consumer_group = $("#ke_alarm_consumer_group").val();
-		var ke_alarm_consumer_topic = $("#ke_alarm_consumer_topic").val();
-		var ke_topic_lag = $("#ke_topic_lag").val();
-		var ke_alarm_cluster_level = $("#ke_alarm_cluster_level").val();
-		var ke_alarm_cluster_maxtimes = $("#ke_alarm_cluster_maxtimes").val();
-		var ke_alarm_cluster_group = $("#ke_alarm_cluster_group").val();
+    function contextConsumerFormValid() {
+        var ke_alarm_consumer_group = $("#ke_alarm_consumer_group").val();
+        var ke_alarm_consumer_topic = $("#ke_alarm_consumer_topic").val();
+        var ke_topic_lag = $("#ke_topic_lag").val();
+        var ke_alarm_crontab = $("#ke_alarm_crontab").val();
+        var ke_alarm_cluster_level = $("#ke_alarm_cluster_level").val();
+        var ke_alarm_cluster_maxtimes = $("#ke_alarm_cluster_maxtimes").val();
+        var ke_alarm_cluster_group = $("#ke_alarm_cluster_group").val();
+
+        if (ke_alarm_consumer_group.length == 0 || ke_alarm_consumer_topic.length == 0 || ke_topic_lag.length == 0 || ke_alarm_cluster_level.length == 0 || ke_alarm_cluster_maxtimes.length == 0 || ke_alarm_cluster_group.length == 0) {
+            $("#alert_consumer_message").show();
+            setTimeout(function () {
+                $("#alert_consumer_message").hide()
+            }, 3000);
+            return false;
+        }
+
+        if (isNaN(ke_topic_lag)) {
+            $("#alert_consumer_message").show();
+            setTimeout(function () {
+                $("#alert_consumer_message").hide()
+            }, 3000);
+            return false;
+        }
 
-		if (ke_alarm_consumer_group.length == 0 || ke_alarm_consumer_topic.length == 0 || ke_topic_lag.length == 0 || ke_alarm_cluster_level.length == 0 || ke_alarm_cluster_maxtimes.length == 0 || ke_alarm_cluster_group.length == 0) {
-			$("#alert_consumer_message").show();
-			setTimeout(function() {
-				$("#alert_consumer_message").hide()
-			}, 3000);
-			return false;
-		}
-		
-		if (isNaN(ke_topic_lag)) {
-			$("#alert_consumer_message").show();
-			setTimeout(function() {
-				$("#alert_consumer_message").hide()
-			}, 3000);
-			return false;
-		}
+        if (isNaN(ke_alarm_crontab)) {
+            $("#alert_consumer_message").show();
+            setTimeout(function () {
+                $("#alert_consumer_message").hide()
+            }, 3000);
+            return false;
+        }
 
-		return true;
-	}
+        return true;
+    }
 </script>
 </html>
