Highlight important information, errors or warnings.
When to use
Use an Alert when your need to get the user's attention and provide important information on the screen.
Alert Type
The Info lets the user know that something unexpected happened in the system and usually isn't due to user interaction. 
The Success Alert is used to inform users that performed an action successfully.
The Warning should appear when the user is about to do something that is destructive or when the result of an action is unexpected but isn't considered an error. 
The Error Alert is used to inform users that something went wrong and help them out finding a solution.
Show Close Button
Enable the close button on the Alert block.
See more information on implementing this pattern in the product documentation
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