[monitoring-template] feat(mysql): add database account expiry metrics

hertzbeat-manager/src/main/resources/define/app-mysql.md

@@ -0,0 +1,37 @@
+# MySQL Account Expiry
+
+HertzBeat supports monitoring of MySQL database account password expiration,
+allowing administrators to detect expired or soon-to-expire accounts and
+configure alerts.
+
+---
+
+## Metric: account_expiry
+
+This metric collects password expiration information for all MySQL users.
+
+### Fields
+
+| Field | Description |
+|------|-------------|
+| user | MySQL user name |
+| host | Host from which the user can connect |
+| days_left | Remaining days before password expires. NULL means no expiry policy |
+| password_expired | Whether the password is already expired (Y or N) |
+
+---
+
+## SQL
+
+The metric is collected using:
+
+```sql
+SELECT
+  user,
+  host,
+  password_expired,
+  IF(password_lifetime IS NULL,
+     NULL,
+     password_lifetime - DATEDIFF(NOW(), password_last_changed)
+  ) AS days_left
+FROM mysql.user;

hertzbeat-manager/src/main/resources/define/app-mysql.yml

@@ -1178,3 +1178,69 @@ metrics:
         privateKey: ^_^sshPrivateKey^_^
         privateKeyPassphrase: ^_^sshPrivateKeyPassphrase^_^
         shareConnection: ^_^sshShareConnection^_^
+  - name: account_expiry
+    priority: 100
+    i18n:
+      zh-CN: 数据库账号有效期
+      en-US: Account Expiry
+      ja-JP: アカウント有効期限
+    fields:
+      - field: user
+        type: 1
+        label: true
+        i18n:
+          zh-CN: 用户
+          en-US: User
+          ja-JP: ユーザー
+      - field: host
+        type: 1
+        label: true
+        i18n:
+          zh-CN: 主机
+          en-US: Host
+          ja-JP: ホスト
+      - field: days_left
+        type: 0
+        i18n:
+          zh-CN: 剩余天数
+          en-US: Days Left
+          ja-JP: 残り日数
+      - field: password_expired
+        type: 1
+        i18n:
+          zh-CN: 是否已过期
+          en-US: Password Expired
+          ja-JP: 期限切れ
+
+    protocol: jdbc
+    jdbc:
+      host: ^_^host^_^
+      port: ^_^port^_^
+      platform: mysql
+      username: ^_^username^_^
+      password: ^_^password^_^
+      database: mysql
+      timeout: ^_^timeout^_^
+      queryType: multiRow
+      sql: |
+        SELECT
+          user,
+          host,
+          IF(password_lifetime IS NULL,
+             NULL,
+             password_lifetime - DATEDIFF(NOW(), password_last_changed)
+          ) AS days_left,
+          password_expired
+        FROM mysql.user;
+      url: ^_^url^_^
+      sshTunnel:
+        enable: ^_^enableSshTunnel^_^
+        host: ^_^sshHost^_^
+        port: ^_^sshPort^_^
+        timeout: ^_^sshTimeout^_^
+        username: ^_^sshUsername^_^
+        password: ^_^sshPassword^_^
+        privateKey: ^_^sshPrivateKey^_^
+        privateKeyPassphrase: ^_^sshPrivateKeyPassphrase^_^
+        shareConnection: ^_^sshShareConnection^_^
+