Display Active Monitoring menu entry even when disabled

scripts/plugins/active_monitoring/web_gui/active_monitoring_stats.lua

@@ -15,6 +15,7 @@ local active_monitoring_utils = plugins_utils.loadModule("active_monitoring", "a
 
 local graph_utils = require("graph_utils")
 local alert_utils = require("alert_utils")
+local user_scripts = require("user_scripts")
 
 local ts_creation = plugins_utils.timeseriesCreationEnabled()
 
@@ -37,6 +38,19 @@ local url = base_url
 local info = ntop.getInfo()
 local measurement_info
 
+if(not user_scripts.isSystemScriptEnabled("active_monitoring")) then
+  -- The active monitoring is disabled
+  print[[<div class="alert alert-warning" role="alert">]]
+  print(i18n("host_config.active_monitor_enable", {
+    url=ntop.getHttpPrefix() .. '/lua/admin/edit_configset.lua?confset_id=0&subdir=system&user_script=active_monitoring#all'
+  }))
+  print[[</div>]]
+
+  dofile(dirs.installdir .. "/scripts/lua/inc/footer.lua")
+
+  return
+end
+
 if(not isEmptyString(host) and not isEmptyString(measurement)) then
   host = active_monitoring_utils.getHost(host, measurement)
   measurement_info = active_monitoring_utils.getMeasurementInfo(host.measurement)

scripts/plugins/active_monitoring/web_gui/menu.lua

@@ -5,8 +5,8 @@ return {
   menu_entry = {key = "active_monitor", i18n_title = "active_monitoring_stats.active_monitoring", section = "system_stats"},
 
   is_shown = function()
-    local user_scripts = require("user_scripts")
-
-    return(user_scripts.isSystemScriptEnabled("active_monitoring"))
+    -- The active monitoring page is always shown. If the plugin is disabled,
+    -- the page itself will show a warning
+    return(true)
   end
 }