luci-app-statistics: CPU plugin: hide 'idle', tweak defaults

* Add functionality to hide the metric of 'idle' state
  from the chart and data table. Many routers are mostly idle,
  and the 98% 'idle' dominates the graph reducing its usefulness.
  Without 'idle', the smaller CPU usage spikes are visible.

* Hide 'idle' by default. Provide config option to show it.
  (note: the option in inside LuCI, and has no impact on actual
   data collection by collectd.)

* Tweak the defaults to use the percentage data by default.
  It makes more sense to average users than jiffies.

* Set the current LuCI defaults also in the config file.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

applications/luci-app-statistics/htdocs/luci-static/resources/statistics/rrdtool/definitions/cpu.js

@@ -15,6 +15,8 @@ return baseclass.extend({
 		if (plugin_instance != '')
 			title = "%H: Processor usage on core #%pi";
 
+		var show_idle = uci.get("luci_statistics", "collectd_cpu", "ShowIdle") == "1" ? true : false;
+
 		if (uci.get("luci_statistics", "collectd_cpu", "ReportByState") == "1") {
 			var cpu = {
 				title: title,
@@ -25,7 +27,7 @@ return baseclass.extend({
 				data: {
 					instances: {
 						cpu: [
-							"idle",
+							...(show_idle ? ["idle"] : []),
 							"interrupt",
 							"nice",
 							"softirq",
@@ -81,7 +83,7 @@ return baseclass.extend({
 				data: {
 					instances: {
 						percent: [
-							"idle",
+							...(show_idle ? ["idle"] : []),
 							"interrupt",
 							"nice",
 							"softirq",

applications/luci-app-statistics/htdocs/luci-static/resources/view/statistics/plugins/cpu.js

@@ -23,8 +23,16 @@ return baseclass.extend({
 		o.rmempty = false;
 		o.depends('enable', '1');
 
+		o = s.option(form.Flag, 'ShowIdle', _('Show Idle state'),
+			_('Report also the value for the idle metric'));
+		o.default = '0';
+		o.rmempty = false;
+		o.depends({'enable': '1', 'ReportByState': '1'});
+
 		o = s.option(form.Flag, 'ValuesPercentage', _('Report in percent'),
 			_('When set to true, we request percentage values'));
+		o.default = '1';
+		o.rmempty = false;
 		o.depends({ 'enable': '1', 'ReportByCpu': '1', 'ReportByState': '1' });
 	},
 

applications/luci-app-statistics/root/etc/config/luci_statistics

@@ -67,6 +67,10 @@ config statistics 'collectd_contextswitch'
 
 config statistics 'collectd_cpu'
 	option enable '1'
+	option ReportByCpu '1'
+	option ReportByState '1'
+	option ShowIdle '0'
+	option ValuesPercentage '1'
 
 config statistics 'collectd_cpufreq'
 	option enable '0'