Show metrics about installed apps and updates (#31)

.gitignore

@@ -1,4 +1,5 @@
 run.sh
 nextcloud-exporter
+nextcloud-exporter.yml
 config.yml
 dist/

collector.go

@@ -18,6 +18,14 @@ var (
 		metricPrefix+"system_info",
 		"Contains meta information about Nextcloud as labels. Value is always 1.",
 		[]string{"version"}, nil)
+	appsInstalledDesc = prometheus.NewDesc(
+		metricPrefix+"apps_installed_total",
+		"Number of currently installed apps",
+		nil, nil)
+	appsUpdatesDesc = prometheus.NewDesc(
+		metricPrefix+"apps_updates_available_total",
+		"Number of apps that have available updates",
+		nil, nil)
 	usersDesc = prometheus.NewDesc(
 		metricPrefix+"users_total",
 		"Number of users of the instance.",
@@ -187,6 +195,14 @@ func collectSimpleMetrics(ch chan<- prometheus.Metric, status serverinfo.ServerI
 		desc  *prometheus.Desc
 		value float64
 	}{
+		{
+			desc:  appsInstalledDesc,
+			value: float64(status.Data.Nextcloud.System.Apps.Installed),
+		},
+		{
+			desc:  appsUpdatesDesc,
+			value: float64(status.Data.Nextcloud.System.Apps.AvailableUpdates),
+		},
 		{
 			desc:  usersDesc,
 			value: float64(status.Data.Nextcloud.Storage.Users),

serverinfo/serverinfo.go

@@ -46,7 +46,7 @@ type System struct {
 	FilelockingEnabled  bool   `xml:"filelocking.enabled"`
 	Debug               bool   `xml:"debug"`
 	FreeSpace           int64  `xml:"freespace"`
-	// <cpuload>
+	Apps                Apps   `xml:"apps"`
 }
 
 const boolYes = "yes"
@@ -63,6 +63,7 @@ func (s *System) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 		FilelockingEnabled  string `xml:"filelocking.enabled"`
 		Debug               string `xml:"debug"`
 		FreeSpace           int64  `xml:"freespace"`
+		Apps                Apps   `xml:"apps"`
 	}
 	if err := d.DecodeElement(&raw, &start); err != nil {
 		return err
@@ -77,9 +78,16 @@ func (s *System) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 	s.FilelockingEnabled = raw.FilelockingEnabled == boolYes
 	s.Debug = raw.Debug == boolYes
 	s.FreeSpace = raw.FreeSpace
+	s.Apps = raw.Apps
 	return nil
 }
 
+// Apps contains information about installed apps and updates.
+type Apps struct {
+	Installed        uint `xml:"num_installed"`
+	AvailableUpdates uint `xml:"num_updates_available"`
+}
+
 // Storage contains information about the nextcloud storage system.
 type Storage struct {
 	Users         uint `xml:"num_users"`