Simplifies host callbacks lua structure with callback_definitions/host

scripts/lua/modules/callback_definitions/host/dns.lua

@@ -0,0 +1,32 @@
+--
+-- (C) 2019-21 - ntop.org
+--
+
+local user_scripts = require("user_scripts")
+local alert_severities = require "alert_severities"
+
+-- #################################################################
+
+local dns = {
+   -- Script category
+   category = user_scripts.script_categories.network,
+
+   default_enabled = false,
+
+   default_value = {
+      operator = "gt",
+      severity = alert_severities.error,
+   },
+
+   gui = {
+      i18n_title = "alerts_thresholds_config.dns_traffic",
+      i18n_description = "alerts_thresholds_config.alert_dns_description",
+      i18n_field_unit = user_scripts.field_units.bytes,
+      input_builder = "threshold_cross",
+      field_operator = "gt";
+   },
+}
+
+-- #################################################################
+
+return dns