From 92320780125cf11f126edceaeaec015daa8c2d7a Mon Sep 17 00:00:00 2001
From: Andrey Butusov <andrey@nspcc.io>
Date: Wed, 11 Sep 2024 20:34:32 +0300
Subject: [PATCH] metrics/ir: `neofs_ir_state_health` metric

Expose health status via Prometheus.

Signed-off-by: Andrey Butusov <andrey@nspcc.io>
---
 CHANGELOG.md             |  2 ++
 pkg/innerring/state.go   |  3 +++
 pkg/metrics/innerring.go | 18 ++++++++++++++++--
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16f95c8924..f216e86c2b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ Changelog for NeoFS Node
 
 ### Added
 - More effective FSTree writer for HDDs, new configuration options for it (#2814)
+- New health statuses in inner ring (#2934)
+- Expose health status of inner ring via Prometheus (#2934)
 
 ### Fixed
 
diff --git a/pkg/innerring/state.go b/pkg/innerring/state.go
index 68be14d00a..c65ece2c12 100644
--- a/pkg/innerring/state.go
+++ b/pkg/innerring/state.go
@@ -201,6 +201,9 @@ func (s *Server) ResetEpochTimer(h uint32) error {
 
 func (s *Server) setHealthStatus(hs control.HealthStatus) {
 	s.healthStatus.Store(hs)
+	if s.metrics != nil {
+		s.metrics.SetHealthCheck(int32(hs))
+	}
 }
 
 // HealthStatus returns the current health status of the IR application.
diff --git a/pkg/metrics/innerring.go b/pkg/metrics/innerring.go
index 9492c29170..9e7204531a 100644
--- a/pkg/metrics/innerring.go
+++ b/pkg/metrics/innerring.go
@@ -8,7 +8,8 @@ const innerRingNameSpace = "neofs_ir"
 
 // InnerRingServiceMetrics contains metrics collected by inner ring.
 type InnerRingServiceMetrics struct {
-	epoch prometheus.Gauge
+	epoch       prometheus.Gauge
+	healthCheck prometheus.Gauge
 }
 
 // NewInnerRingMetrics returns new instance of metrics collectors for inner ring.
@@ -23,8 +24,17 @@ func NewInnerRingMetrics(version string) InnerRingServiceMetrics {
 	})
 	prometheus.MustRegister(epoch)
 
+	healthCheck := prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: innerRingNameSpace,
+		Subsystem: stateSubsystem,
+		Name:      "health",
+		Help:      "Current ir state",
+	})
+	prometheus.MustRegister(healthCheck)
+
 	return InnerRingServiceMetrics{
-		epoch: epoch,
+		epoch:       epoch,
+		healthCheck: healthCheck,
 	}
 }
 
@@ -32,3 +42,7 @@ func NewInnerRingMetrics(version string) InnerRingServiceMetrics {
 func (m InnerRingServiceMetrics) SetEpoch(epoch uint64) {
 	m.epoch.Set(float64(epoch))
 }
+
+func (m InnerRingServiceMetrics) SetHealthCheck(healthCheck int32) {
+	m.healthCheck.Set(float64(healthCheck))
+}