Register the Prometheus metrics

server/instrumentation.go

@@ -21,6 +21,13 @@ var (
 	})
 )
 
+func init() {
+	prometheus.MustRegister(totalKeysInMemory)
+	prometheus.MustRegister(requestsCounter)
+	prometheus.MustRegister(decryptedKeysCounter)
+	prometheus.MustRegister(unlockedKeysServedCounter)
+}
+
 func (s *KeyStore) updateKeyspaceSize() {
 	totalKeysInMemory.Set(float64(len(s.userKeys)))
 }