Alerting (#799)

* add MyTonCtrl alert bot docs

* update sidebars

* update alerting.md

docs/participate/run-nodes/alerting.md

@@ -39,6 +39,13 @@ If you want to receive messages in a group, add the bot to the group, and it wil
     ```bash
    $ sudo systemctl restart mytoncore
     ```
+5. Check that the bot is able to send messages by running the command
+
+    ```bash
+    MyTonCtrl> test_alert
+    ``` 
+    You should receive a message from the bot in your Telegram account or chat.
+
 
 ## Supported Alerts
 
@@ -53,3 +60,11 @@ The MyTonCtrl Alert Bot supports the following alerts:
 * Node is not answering to ADNL connection
 * Validator created zero blocks for past 6 hours
 * Validator has been slashed in the previous validation round
+
+## En(dis)bling Alerts
+
+To enable or disable alerts, use the following commands:
+
+* To enable an alert, use the command `enable_alert <alert-name>`.
+* To disable an alert, use the command `disable_alert <alert-name>`.
+* To check the status of alerts, use the command `alerts_list`.