Calculate disk space stats once per hour

scripts/plugins/disk_monitor/user_scripts/system/disk_monitor.lua

@@ -0,0 +1,40 @@
+--
+-- (C) 2019-20 - ntop.org
+--
+
+local ts_utils = require("ts_utils_core")
+local user_scripts = require("user_scripts")
+local ts_utils = require("ts_utils_core")
+local storage_utils = require("storage_utils")
+
+local script = {
+  -- Script category
+  category = user_scripts.script_categories.system,
+
+  -- This module is enabled by default
+  default_enabled = true,
+
+  -- No default configuration is provided
+  default_value = {},
+
+  -- See below
+  hooks = {},
+
+  gui = {
+    i18n_title = "system_stats.redis.redis_monitor",
+    i18n_description = "system_stats.redis.redis_monitor_description",
+  },
+}
+
+-- ##############################################
+
+-- Defines an hook which is executed every hour
+function script.hooks.hour(params)
+   local info = storage_utils.storageInfo(true --[[ refresh cache ]])
+
+   -- TODO alert if free disk space is too low
+end
+
+-- ##############################################
+
+return(script)