prometheus: Add drafty error counter

Needs tuning, too noisy right now.

1 files changed, 12 insertions, 1 deletions

diff --git a/internal/metrics/metrics.go b/internal/metrics/metrics.go
index 113d28c..17e9cce 100644
--- a/internal/metrics/metrics.go
+++ b/internal/metrics/metrics.go
@@ -11,6 +11,7 @@ type Metrics struct {
 	logIndex         *prometheus.GaugeVec
 	logTimestamp     *prometheus.GaugeVec
 	certificateAlert *prometheus.GaugeVec
+	errorCounter     prometheus.Counter
 }
 
 func NewMetrics(registry *prometheus.Registry) *Metrics {
@@ -43,9 +44,15 @@ func NewMetrics(registry *prometheus.Registry) *Metrics {
 			},
 			[]string{"stored_at"},
 		),
+		errorCounter: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "silentct_error_counter",
+				Help: "The number of errors propagated to the main loop.",
+			},
+		),
 	}
 
-	registry.MustRegister(m.logSize, m.logIndex, m.logTimestamp, m.certificateAlert)
+	registry.MustRegister(m.logSize, m.logIndex, m.logTimestamp, m.certificateAlert, m.errorCounter)
 	return m
 }
 
@@ -69,3 +76,7 @@ func (m *Metrics) CertificateAlert(alerts []index.CertificateInfo) {
 		m.certificateAlert.WithLabelValues(alert.StoredAt).Set(float64(alert.ObservedAt.Unix()))
 	}
 }
+
+func (m *Metrics) CountError() {
+	m.errorCounter.Inc()
+}