resource "aws_cloudwatch_event_rule" "instance_state" {
  name = "instance-state-events"

  event_pattern = <<EOF
{
  "source": ["aws.ec2"],
  "detail-type": ["EC2 Instance State-change Notification"]
}
EOF
}

resource "aws_cloudwatch_event_target" "sns" {
  rule      = aws_cloudwatch_event_rule.instance_state.name
  target_id = "SendToSNS"
  arn       = aws_sns_topic.ec2_events.arn
}