[PRM-134-v2] add alarm examples and subscription into separate file

Author: steph-torres-nhs

infrastructure/im-alerting-alarm-examples.tf

@@ -0,0 +1,121 @@
+# resource "aws_cloudwatch_metric_alarm" "search_patient_error_count_low" {
+#   alarm_name          = "search_patient_error_count_low"
+#   alarm_description   = "Triggers when search patient lambda error count is between 1 and 3 within 2mins"
+#   comparison_operator = "GreaterThanThreshold"
+#   threshold           = 0
+#   evaluation_periods  = 1
+#   alarm_actions       = [module.search_patient_alarm_topic.arn]
+#   ok_actions          = [module.search_patient_alarm_topic.arn]
+#   tags = {
+#     is_kpi       = "true"
+#     alarm_group  = module.search-patient-details-lambda.function_name
+#     alarm_metric = "Errors"
+#     severity     = "low"
+#   }
+#   metric_query {
+#     id          = "error"
+#     label       = "error count for search patient, low if between 1 and 3"
+#     return_data = true
+#     expression  = "IF(m1 >= 1 AND m1 <= 3, 1, 0)"
+#   }
+#
+#   metric_query {
+#     id = "m1"
+#
+#     metric {
+#       metric_name = "Errors"
+#       namespace   = "AWS/Lambda"
+#       period      = 120
+#       stat        = "Sum"
+#       dimensions = {
+#         FunctionName = module.search-patient-details-lambda.function_name
+#       }
+#     }
+#   }
+# }
+#
+# resource "aws_cloudwatch_metric_alarm" "search_patient_error_count_medium" {
+#   alarm_name          = "search_patient_error_count_medium"
+#   alarm_description   = "Triggers when search patient lambda error count is between 4 and 6 within 2mins"
+#   comparison_operator = "GreaterThanThreshold"
+#   threshold           = 0
+#   evaluation_periods  = 1
+#   alarm_actions       = [module.search_patient_alarm_topic.arn]
+#   ok_actions          = [module.search_patient_alarm_topic.arn]
+#   tags = {
+#     is_kpi       = "true"
+#     alarm_group  = module.search-patient-details-lambda.function_name
+#     alarm_metric = "Errors"
+#     severity     = "medium"
+#   }
+#   metric_query {
+#     id          = "error"
+#     label       = "error count for search patient, medium if between 4 and 6"
+#     return_data = true
+#     expression  = "IF(m1 >= 4 AND m1 <= 6, 1, 0)"
+#   }
+#
+#   metric_query {
+#     id = "m1"
+#
+#     metric {
+#       metric_name = "Errors"
+#       namespace   = "AWS/Lambda"
+#       period      = 120
+#       stat        = "Sum"
+#       dimensions = {
+#         FunctionName = module.search-patient-details-lambda.function_name
+#       }
+#     }
+#   }
+# }
+#
+# resource "aws_cloudwatch_metric_alarm" "search_patient_error_count_high" {
+#   alarm_name          = "search_patient_error_count_high"
+#   alarm_description   = "Triggers when search patient lambda error count is 7 or above"
+#   comparison_operator = "GreaterThanThreshold"
+#   threshold           = 0
+#   evaluation_periods  = 1
+#   alarm_actions       = [module.search_patient_alarm_topic.arn]
+#   ok_actions          = [module.search_patient_alarm_topic.arn]
+#   tags = {
+#     is_kpi       = "true"
+#     alarm_group  = module.search-patient-details-lambda.function_name
+#     alarm_metric = "Errors"
+#     severity     = "high"
+#   }
+#   metric_query {
+#     id          = "error"
+#     label       = "error count for search patient, high if 7 or above"
+#     return_data = true
+#     expression  = "IF(m1 >= 7, 1, 0)"
+#   }
+#
+#   metric_query {
+#     id = "m1"
+#
+#     metric {
+#       metric_name = "Errors"
+#       namespace   = "AWS/Lambda"
+#       period      = 120
+#       stat        = "Sum"
+#       dimensions = {
+#         FunctionName = module.search-patient-details-lambda.function_name
+#       }
+#     }
+#   }
+# }
+
+# resource "aws_sns_topic_subscription" "im_alerting_search_patient" {
+#   endpoint  = module.im-alerting-lambda.lambda_arn
+#   protocol  = "lambda"
+#   topic_arn = module.search_patient_alarm_topic.arn
+# }
+#
+# resource "aws_lambda_permission" "im_alerting_invoke_with_search_patient_sns" {
+#   statement_id  = "AllowExecutionFromSeachPatientAlarmSNS"
+#   action        = "lambda:InvokeFunction"
+#   function_name = module.im-alerting-lambda.lambda_arn
+#   principal     = "sns.amazonaws.com"
+#   source_arn    = module.search_patient_alarm_topic.arn
+# }