prometheus: Add silentct_need_restart

1 files changed, 12 insertions, 1 deletions

diff --git a/internal/metrics/metrics.go b/internal/metrics/metrics.go
index 17e9cce..c5ff0d6 100644
--- a/internal/metrics/metrics.go
+++ b/internal/metrics/metrics.go
@@ -12,6 +12,7 @@ type Metrics struct {
 	logTimestamp     *prometheus.GaugeVec
 	certificateAlert *prometheus.GaugeVec
 	errorCounter     prometheus.Counter
+	needRestart      prometheus.Gauge
 }
 
 func NewMetrics(registry *prometheus.Registry) *Metrics {
@@ -50,9 +51,15 @@ func NewMetrics(registry *prometheus.Registry) *Metrics {
 				Help: "The number of errors propagated to the main loop.",
 			},
 		),
+		needRestart: prometheus.NewGauge(
+			prometheus.GaugeOpts{
+				Name: "silentct_need_restart",
+				Help: "A non-zero value if the monitor needs restarting.",
+			},
+		),
 	}
 
-	registry.MustRegister(m.logSize, m.logIndex, m.logTimestamp, m.certificateAlert, m.errorCounter)
+	registry.MustRegister(m.logSize, m.logIndex, m.logTimestamp, m.certificateAlert, m.errorCounter, m.needRestart)
 	return m
 }
 
@@ -80,3 +87,7 @@ func (m *Metrics) CertificateAlert(alerts []index.CertificateInfo) {
 func (m *Metrics) CountError() {
 	m.errorCounter.Inc()
 }
+
+func (m *Metrics) NeedRestart() {
+	m.needRestart.Set(float64(1))
+}