Create a User-Defined Event
Applies to: 
SQL Server
Azure SQL Managed Instance
Important
On Azure SQL Managed Instance, most, but not all SQL Server Agent features are currently supported. See Azure SQL Managed Instance T-SQL differences from SQL Server for details.
You can create user-defined events if you want to monitor events other than events that are predefined by SQL Server. You can also assign a severity level to each user-defined event.
Note
When using SQL Server Management Studio, select the Write to Windows application event log option for each user-defined event message, to ensure that the messages are logged. By default, user-defined messages of severity lower than 19 are not sent to the Microsoft Windows application log when they occur. User-defined messages of severity lower than 19 therefore do not trigger SQL Server Agent alerts.
User-defined events must have a unique message number. Message numbers for a user-defined event must be greater than 50,000. You can define messages for the event in multiple languages. However, an En-US error message must exist before messages in other languages can be added.
If you administer a multiple-language SQL Server environment, create user-defined messages in each of the languages that are supported. For example, if you are creating a new event message to be used on both an English and a German server, use the same message number and severity for both, but assign a different language to each.
The following tasks provide information about how to create user-defined events and alerts that respond to them:
To create an alert based on a message number
To create an alert based on severity levels
To define the response to an alert
To create a user-defined event error message
To modify a user-defined event error message
To delete a user-defined event error message
To disable or reactivate an alert