The CloudWatchErrorAlarmDecorator associates a CloudWatch alarm and destination with your Lambda function.
Sample usage:
lambdaFn, _ := sparta.NewAWSLambda("Hello World",
helloWorld,
sparta.IAMRoleDefinition{})
lambdaFn.Decorators = []sparta.TemplateDecoratorHandler{
spartaDecorators.CloudWatchErrorAlarmDecorator(1,
1,
1,
gocf.String("MY_SNS_ARN")),
}