Allow adjusting log retention on cron monitoring lambda logs (#17613)

terraform/addons/monitoring/main.tf

@@ -444,7 +444,7 @@ data "aws_iam_policy_document" "cron_monitoring_lambda" {
 resource "aws_cloudwatch_log_group" "cron_monitoring_lambda" {
   count             = var.cron_monitoring == null ? 0 : 1
   name              = "/aws/lambda/${var.customer_prefix}-cron-monitoring"
-  retention_in_days = 7
+  retention_in_days = var.cron_monitoring.log_retention_in_days
 
 }
 

terraform/addons/monitoring/variables.tf

@@ -68,7 +68,8 @@ variable "cron_monitoring" {
     subnet_ids                 = list(string)
     rds_security_group_id      = string
     delay_tolerance            = string
-    run_interval               = string    
+    run_interval               = string
+    log_retention_in_days      = optional(number, 7)
   })
   default = null
 }