*: cleanup collector API 1 (#1547)

pkg/collector/cpu_info/cpu_info.go

@@ -25,37 +25,42 @@ type Config struct{}
 
 var ConfigDefaults = Config{}
 
-// A collector is a Prometheus collector for a few WMI metrics in Win32_Processor
-type collector struct {
+// A Collector is a Prometheus Collector for a few WMI metrics in Win32_Processor
+type Collector struct {
 	logger log.Logger
 
-	CpuInfo *prometheus.Desc
+	cpuInfo *prometheus.Desc
 }
 
-func New(logger log.Logger, _ *Config) types.Collector {
-	c := &collector{}
+func New(logger log.Logger, _ *Config) *Collector {
+	c := &Collector{}
 	c.SetLogger(logger)
+
 	return c
 }
 
-func NewWithFlags(_ *kingpin.Application) types.Collector {
-	return &collector{}
+func NewWithFlags(_ *kingpin.Application) *Collector {
+	return &Collector{}
 }
 
-func (c *collector) GetName() string {
+func (c *Collector) GetName() string {
 	return Name
 }
 
-func (c *collector) SetLogger(logger log.Logger) {
+func (c *Collector) SetLogger(logger log.Logger) {
 	c.logger = log.With(logger, "collector", Name)
 }
 
-func (c *collector) GetPerfCounter() ([]string, error) {
+func (c *Collector) GetPerfCounter() ([]string, error) {
 	return []string{}, nil
 }
 
-func (c *collector) Build() error {
-	c.CpuInfo = prometheus.NewDesc(
+func (c *Collector) Close() error {
+	return nil
+}
+
+func (c *Collector) Build() error {
+	c.cpuInfo = prometheus.NewDesc(
 		prometheus.BuildFQName(types.Namespace, "", Name),
 		"Labelled CPU information as provided provided by Win32_Processor",
 		[]string{
@@ -85,7 +90,7 @@ type win32_Processor struct {
 
 // Collect sends the metric values for each metric
 // to the provided prometheus Metric channel.
-func (c *collector) Collect(_ *types.ScrapeContext, ch chan<- prometheus.Metric) error {
+func (c *Collector) Collect(_ *types.ScrapeContext, ch chan<- prometheus.Metric) error {
 	if err := c.collect(ch); err != nil {
 		_ = level.Error(c.logger).Log("msg", "failed collecting cpu_info metrics", "err", err)
 		return err
@@ -93,7 +98,7 @@ func (c *collector) Collect(_ *types.ScrapeContext, ch chan<- prometheus.Metric)
 	return nil
 }
 
-func (c *collector) collect(ch chan<- prometheus.Metric) error {
+func (c *Collector) collect(ch chan<- prometheus.Metric) error {
 	var dst []win32_Processor
 	// We use a static query here because the provided methods in wmi.go all issue a SELECT *;
 	// This results in the time-consuming LoadPercentage field being read which seems to measure each CPU
@@ -108,7 +113,7 @@ func (c *collector) collect(ch chan<- prometheus.Metric) error {
 	// Some CPUs end up exposing trailing spaces for certain strings, so clean them up
 	for _, processor := range dst {
 		ch <- prometheus.MustNewConstMetric(
-			c.CpuInfo,
+			c.cpuInfo,
 			prometheus.GaugeValue,
 			1.0,
 			strconv.Itoa(int(processor.Architecture)),