Initial QSfera import

Server/services/proxy/pkg/metrics/metrics.go

@@ -0,0 +1,61 @@
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	// Namespace defines the namespace for the defines metrics.
+	Namespace = "qsfera"
+
+	// Subsystem defines the subsystem for the defines metrics.
+	Subsystem = "proxy"
+)
+
+// Metrics defines the available metrics of this service.
+type Metrics struct {
+	Requests  *prometheus.CounterVec
+	Errors    *prometheus.CounterVec
+	Duration  *prometheus.HistogramVec
+	BuildInfo *prometheus.GaugeVec
+}
+
+// New initializes the available metrics.
+func New() *Metrics {
+	m := &Metrics{
+		Requests: prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "requests_total",
+			Help:      "How many requests processed in total",
+		}, []string{"method"}),
+		Errors: prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "errors_total",
+			Help:      "How many requests run into errors",
+		}, []string{"method"}),
+		Duration: prometheus.NewHistogramVec(prometheus.HistogramOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "duration_seconds",
+			Help:      "request duration in seconds",
+		}, []string{"method"}),
+		BuildInfo: prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "build_info",
+			Help:      "Build Information",
+		}, []string{"version"}),
+	}
+
+	// Initialize the metrics with 0
+	m.Requests.WithLabelValues("GET").Add(0)
+	m.Errors.WithLabelValues("GET").Add(0)
+
+	_ = prometheus.Register(m.Requests)
+	_ = prometheus.Register(m.Errors)
+	_ = prometheus.Register(m.Duration)
+	_ = prometheus.Register(m.BuildInfo)
+	return m
+}