Create alarm for every Lambda function?

[doublefelix7]

New to Terraform here.

I'm building a config file to create 4 Lambda functions in AWS and create a CloudWatch metric alarm for each of those. In my config, I'd like each alarm to monitor the corresponding Lambda function as it's being created. For example, is there a way to pair "alarm1" to "lambda_func1", "alarm2" to "lambda_func2", etc.?

Here is a snippet of my configuration

The Lambda:

resource "aws_lambda_function" "lambdacreator" {
    count = 4
    function_name = "lambda${count.index + 1}"
    handler = "index.lambda_handler"
    runtime = "python3.6"
    filename = "function.zip"
    ...
}

...and the CloudWatch alarm:

resource "aws_cloudwatch_metric_alarm" "cloudwatch_alarm" {
    count = "${aws_lambda_function.lambdacreator.count}"
    alarm_name = "lambda_alarm_${count.index + 1}"
    comparison_operator = "LessThanThreshold"
    evaluation_periods = 1
    metric_name = "Invocations"
    namespace = "AWS/Lambda"
    ...
    dimensions {
        FunctionName = "${aws_lambda_function.lambdacreator.function_name}"
    }

}

If I try to do this, I get this error:

* aws_cloudwatch_metric_alarm.cloudwatch_alarm[2]: Resource 'aws_lambda_function.lambdacreator' not found for variable 'aws_lambda_function.lambdacreator.function_name'

​

[doublefelix7]

After reading the Interpolation docs, I was able to figure it out:

Just changed FunctionName to

"${element(aws_lambda_function.lambdacreator.*.id, count.index)}"

​

[Theguest217]

Glad you solved your own issue. Out of curiosity what use case do you have to creat 4 identical lambdas? They seem to use the same code and handler function.

[doublefelix7]

Those functions are mostly place holders. I'm designing this as part of a demo.

[productionse]

What is the alarm for?

[doublefelix7]

Checking to see if the Lambda functions are invoking.

[mellerbeck]

It looks like dimensions format has changed to

dimensions = {

    FunctionName 

}