[#50] ir: Add Health status

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/innerring/state.go

@@ -167,6 +167,9 @@ func (s *Server) ResetEpochTimer(h uint32) error {
 
 func (s *Server) setHealthStatus(hs control.HealthStatus) {
 	s.healthStatus.Store(hs)
+	if s.metrics != nil {
+		s.metrics.SetHealth(int32(hs))
+	}
 }
 
 // HealthStatus returns the current health status of the IR application.

pkg/metrics/innerring.go

@@ -2,11 +2,12 @@ package metrics
 
 import "github.com/prometheus/client_golang/prometheus"
 
-const innerRingSubsystem = "object"
+const innerRingSubsystem = "ir"
 
 // InnerRingServiceMetrics contains metrics collected by inner ring.
 type InnerRingServiceMetrics struct {
-	epoch prometheus.Gauge
+	epoch  prometheus.Gauge
+	health prometheus.Gauge
 }
 
 // NewInnerRingMetrics returns new instance of metrics collectors for inner ring.
@@ -18,12 +19,20 @@ func NewInnerRingMetrics() InnerRingServiceMetrics {
 			Name:      "epoch",
 			Help:      "Current epoch as seen by inner-ring node.",
 		})
+		health = prometheus.NewGauge(prometheus.GaugeOpts{
+			Namespace: namespace,
+			Subsystem: innerRingSubsystem,
+			Name:      "health",
+			Help:      "Current inner-ring node state.",
+		})
 	)
 
 	prometheus.MustRegister(epoch)
+	prometheus.MustRegister(health)
 
 	return InnerRingServiceMetrics{
-		epoch: epoch,
+		epoch:  epoch,
+		health: health,
 	}
 }
 
@@ -31,3 +40,8 @@ func NewInnerRingMetrics() InnerRingServiceMetrics {
 func (m InnerRingServiceMetrics) SetEpoch(epoch uint64) {
 	m.epoch.Set(float64(epoch))
 }
+
+// SetHealth updates health metrics.
+func (m InnerRingServiceMetrics) SetHealth(s int32) {
+	m.health.Set(float64(s))
+}