terraform.aws-baseline-infra/modules/ManagementGovernance/Monitoring.EventBridge/main.tf

resource "aws_cloudwatch_event_rule" "EventRule" {
  name          = "${var.cw-alarm-prefix}-health-events"
  description   = "A CloudWatch Event Rule that triggers on changes in the status of AWS Personal Health Dashboard (AWS Health) and forwards the events to an SNS topic."
  state         = var.actions-enabled
  event_pattern = <<PATTERN
{
  "detail": {
    "service": ["DIRECTCONNECT", "VPN", "LAMBDA", "EC2", "RDS"]
  },
  "detail-type": [
    "AWS Health Event"
  ],
  "source": [
    "aws.health"
  ]
}
PATTERN
  lifecycle {
    ignore_changes = [tags["LastModified"]]
  }
}

resource "aws_cloudwatch_event_target" "TargetForEventRule" {
  rule = aws_cloudwatch_event_rule.EventRule.name
  # target_id = "health-event-notification-sns"
  arn = var.settings.healthEvents.action
  input_transformer {
    input_paths = {
      "account" : "$.account",
      "endTime" : "$.detail.endTime",
      "message" : "$.detail.eventDescription[0].latestDescription",
      "resources" : "$.resources",
      "service" : "$.detail.service",
      "startTime" : "$.detail.startTime"
    }
    input_template = <<EOF
"A maintenance has been scheduled for <service> on AWS account <account>."

"Resources: <resources>"
"Start time: <startTime>"
"End time: <endTime>"

"Detail: <message>"
EOF
  }
}