add cloudwatch metric alarm notification on load balancer #303

Job	Run time
destroy-development	0s
strategy / strategy	3s
terraform (production, plan) / plan	57s
terraform (development, plan_apply) / plan	1m 2s
terraform (preproduction, plan) / plan	53s
terraform (preproduction, plan) / apply	0s
terraform (production, plan) / apply	0s
terraform (development, plan_apply) / apply	1m 5s
	4m 0s

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