Implemented QoE Issues Alert (#9033)

* Implemented QoE Issues Alert

* Fixed QoE Issue alert serializer

scripts/lua/modules/alert_definitions/flow/alert_qoe_degraded.lua

@@ -0,0 +1,61 @@
+--
+-- (C) 2019-25 - ntop.org
+--
+
+-- ##############################################
+
+local flow_alert_keys = require "flow_alert_keys"
+-- Import the classes library.
+local classes = require "classes"
+-- Make sure to import the Superclass!
+local alert = require "alert"
+-- Import Mitre Att&ck utils
+local mitre = require "mitre_utils"
+
+local format_utils = require "format_utils"
+
+-- ##############################################
+
+local alert_qoe_degraded = classes.class(alert)
+
+-- ##############################################
+
+alert_qoe_degraded.meta = {
+   alert_key = flow_alert_keys.flow_alert_qoe_degraded,
+   i18n_title = "flow_checks_config.qoe_degraded_title",
+   icon = "fas fa-fw fa-exclamation",
+
+   -- Mitre Att&ck Matrix values
+   mitre_values = {
+   },
+}
+
+-- ##############################################
+
+-- @brief Prepare an alert table used to generate the alert
+-- @param one_flow_param The first alert param
+-- @param another_flow_param The second alert param
+-- @return A table with the alert built
+function alert_qoe_degraded:init()
+   -- Call the parent constructor
+   self.super:init()
+end
+
+-- #######################################################
+
+function alert_qoe_degraded.format(ifid, alert, alert_type_params)
+   local qoe = "Degraded"
+   if alert_type_params["qoe_score"] <= 30 then
+      qoe = "Poor"
+   end
+   
+   return i18n("alert_messages.qoe_degraded", {
+      qoe = qoe,
+      qoe_score = alert_type_params["qoe_score"]
+   })
+
+end
+
+-- #######################################################
+
+return alert_qoe_degraded