fix: syntax missing brackets

Author: kuntalkumarbasu

monitoring.tf

@@ -18,7 +18,7 @@ resource "datadog_monitor" "dead_letters_monitor" {
     dead_letters_queue_name = each.key
     notify                  = join(", ", var.dl_alert_recipients)
   })
-  query = "avg(last_1h):avg:aws.sqs.approximate_number_of_messages_visible{queuename:${each.key}${local.additional_query_conditions} > ${var.dl_critical}"
+  query = "avg(last_1h):avg:aws.sqs.approximate_number_of_messages_visible{queuename:${each.key}${local.additional_query_conditions} > ${var.dl_critical}}"
 
   monitor_thresholds {
     warning  = var.dl_warning