fix: Typo alert cosmos_biz_db_provisioned_throughput_exceeded (#3606)

* fix-typo-alert-name-cosmos_biz_db_provisioned_throughput_exceeded

* disable cosmos_biz_db_normalized_ru_exceeded vs 429 errors

* add comment

* fixo typo

Author: pasqualespica

src/domains/bizevents-common/03_cosmosdb_bizevents_datastore.tf

@@ -213,6 +213,7 @@ resource "azurerm_monitor_metric_alert" "cosmos_biz_db_normalized_ru_exceeded" {
   window_size         = "PT5M"
   frequency           = "PT5M"
   auto_mitigate       = false
+  enabled             = false # TODO disabled TMP
 
 
   # Metric info
@@ -247,10 +248,16 @@ resource "azurerm_monitor_metric_alert" "cosmos_biz_db_normalized_ru_exceeded" {
   tags = module.tag_config.tags
 }
 
+
+# In general, for a production workload, if you see between 1-5% of requests with 429s, 
+# and your end-to-end latency is acceptable, this is a healthy sign that the RU/s are being fully utilized. 
+# In this case, the normalized RU consumption metric reaching 100% only means that in a given second, 
+# at least one partition key range used all its provisioned throughput. 
+# This is acceptable because the overall rate of 429s is still low. No further action is required.
 resource "azurerm_monitor_metric_alert" "cosmos_biz_db_provisioned_throughput_exceeded" { # https://github.com/pagopa/terraform-azurerm-v3/blob/58f14dc120e10bd3515bcc34e0685e74d1d11047/cosmosdb_account/main.tf#L205
   count = var.env_short == "p" ? 1 : 0
 
-  name                = "[${var.domain != null ? "${var.domain} | " : ""}${module.bizevents_datastore_cosmosdb_account.name}] 409 Throttling Errors Exceeded"
+  name                = "[${var.domain != null ? "${var.domain} | " : ""}${module.bizevents_datastore_cosmosdb_account.name}] 429 Throttling Errors Exceeded"
   resource_group_name = azurerm_resource_group.bizevents_rg.name
   scopes              = [module.bizevents_datastore_cosmosdb_account.id]
   description         = "A collection throughput (RU/s) exceed provisioned throughput, and it's raising 429 errors. Please, consider to increase RU. Runbook: not needed."
@@ -267,7 +274,7 @@ resource "azurerm_monitor_metric_alert" "cosmos_biz_db_provisioned_throughput_ex
     metric_name            = "TotalRequestUnits"
     aggregation            = "Total"
     operator               = "GreaterThan"
-    threshold              = 1
+    threshold              = 100 # https://learn.microsoft.com/en-us/azure/cosmos-db/monitor-normalized-request-units?utm_source=chatgpt.com#what-to-expect-and-do-when-normalized-rus-is-higher
     skip_metric_validation = false
 
     dimension {