NEW: monitor health events with eventbridge

Signed-off-by: xpk <xpk@headdesk.me>

modules/ManagementGovernance/Monitoring.EventBridge/README.md

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+# Monitoring module 
+This module deploys the default cloudwatch metric monitoring
+
+## Notes
+Terraform lifecycle ignores tags to speed up terraform subsequent update. Cloudwatch alarm tags cannot be read on aws console anyway.

modules/ManagementGovernance/Monitoring.EventBridge/main.tf

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+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."
+  is_enabled = var.actions-enabled
+  event_pattern = <<PATTERN
+{
+  "detail-type": [
+    "AWS Health Event"
+  ],
+  "source": [
+    "aws.health"
+  ]
+}
+PATTERN
+  tags = var.default-tags
+}
+
+resource "aws_cloudwatch_event_target" "TargetForEventRule" {
+  rule = aws_cloudwatch_event_rule.EventRule.name
+  target_id = "rackspace-standard-sns"
+  arn = var.sns-targets.alarm-actions-standard
+}

modules/ManagementGovernance/Monitoring.EventBridge/provider.tf

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+terraform {
+  required_version = "~> 1.3.0"
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 4.36.1"
+    }
+  }
+}

modules/ManagementGovernance/Monitoring.EventBridge/variables.tf

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+variable cw-alarm-prefix {}
+variable actions-enabled {}
+
+variable sns-targets {}
+variable default-tags {}