Revert "Migrates alerts to an object-oriented implementation"

This reverts commit fbc283f12f.

scripts/lua/modules/alert_definitions/alert_internals.lua

@@ -2,40 +2,28 @@
 -- (C) 2019-20 - ntop.org
 --
 
--- ##############################################
-
 local alert_keys = require "alert_keys"
 
-local status_keys = require "flow_keys"
--- Import the classes library.
-local classes = require "classes"
--- Make sure to import the Superclass!
-local alert = require "alert"
-
--- ##############################################
-
-local alert_internals = classes.class(alert)
-
--- ##############################################
-
-alert_internals.meta = {
-  status_key = status_keys.ntopng.status_not_purged,
-  alert_key = alert_keys.ntopng.alert_internals,
-  i18n_title = "flow_details.not_purged",
-  icon = "fas fa-exclamation",
-}
-
--- ##############################################
+-- #######################################################
 
 -- @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
+-- @param alert_severity A severity as defined in `alert_severities`
 -- @return A table with the alert built
-function alert_internals:init()
-   -- Call the parent constructor
-   self.super:init()
+local function createInternals(alert_severity)
+   local built = {
+      alert_severity = alert_severity,
+      alert_type_params = {
+      }
+   }
+
+   return built
 end
 
 -- #######################################################
 
-return alert_internals
+return {
+  alert_key = alert_keys.ntopng.alert_internals,
+  i18n_title = "alerts_dashboard.internal_issues",
+  icon = "fas fa-exclamation",
+  creator = createInternals,
+}