diff --git a/apps/emqx_conf/i18n/emqx_conf_schema.conf b/apps/emqx_conf/i18n/emqx_conf_schema.conf
index edef14a9c..d0d08cb55 100644
--- a/apps/emqx_conf/i18n/emqx_conf_schema.conf
+++ b/apps/emqx_conf/i18n/emqx_conf_schema.conf
@@ -245,11 +245,12 @@ Note: probe messages are broadcast to all the specified ports.
 
   cluster_dns_name {
     desc {
-      en: """The domain name of the EMQX cluster."""
-      zh: """指定 DNS A 记录的名字。emqx 会通过访问这个 DNS A 记录来获取 IP 地址列表，
-然后拼接 cluster.dns.app 里指定的 APP 名得到集群中所有节点的列表。
-当 cluster.discovery_strategy 为 dns 时，此配置项才有效。
-          """
+      en: """The domain name from which to discover peer EMQX nodes' IP addresses.
+Applicable when <code>cluster.discovery_strategy = dns</code>
+"""
+      zh: """指定 DNS A 记录的名字。emqx 会通过访问这个 DNS A 记录来获取 IP 地址列表。
+当<code>cluster.discovery_strategy</code> 为 <code>dns</code> 时有效。
+"""
     }
     label {
       en: "Cluster Dns Name"
@@ -257,19 +258,6 @@ Note: probe messages are broadcast to all the specified ports.
     }
   }
 
-  cluster_dns_app {
-    desc {
-      en: """The symbolic name of the EMQX service."""
-      zh: """用来与从 cluster.dns.name 获取的 IP 列表拼接得到节点名列表。
-当 cluster.discovery_strategy 为 dns 时，此配置项才有效。
-         """
-    }
-    label {
-      en: "Cluster DNS App"
-      zh: "DNS前缀标识"
-    }
-  }
-
   cluster_etcd_server {
     desc {
       en: """List of endpoint URLs of the etcd cluster"""
diff --git a/apps/emqx_conf/src/emqx_conf_schema.erl b/apps/emqx_conf/src/emqx_conf_schema.erl
index ce4d112ac..7960eba7f 100644
--- a/apps/emqx_conf/src/emqx_conf_schema.erl
+++ b/apps/emqx_conf/src/emqx_conf_schema.erl
@@ -288,15 +288,6 @@ fields(cluster_dns) ->
                     'readOnly' => true
                 }
             )},
-        {"app",
-            sc(
-                string(),
-                #{
-                    default => "emqx",
-                    desc => ?DESC(cluster_dns_app),
-                    'readOnly' => true
-                }
-            )}
     ];
 fields(cluster_etcd) ->
     [
@@ -1291,8 +1282,7 @@ options(mcast, Conf) ->
     ];
 options(dns, Conf) ->
     [
-        {name, conf_get("cluster.dns.name", Conf)},
-        {app, conf_get("cluster.dns.app", Conf)}
+        {name, conf_get("cluster.dns.name", Conf)}
     ];
 options(etcd, Conf) ->
     Namespace = "cluster.etcd.ssl",