initialise dashboard values

p2p/protocol/holepunch/metrics.go

@@ -71,6 +71,19 @@ func NewMetricsTracer(opts ...MetricsTracerOption) MetricsTracer {
 		opt(setting)
 	}
 	metricshelper.RegisterCollectors(setting.reg, collectors...)
+	// initialise metrics's labels so that the first data point is handled correctly
+	for _, side := range []string{"initiator", "receiver"} {
+		for _, numAttempts := range []string{"1", "2", "3", "4"} {
+			for _, outcome := range []string{"success", "failed", "cancelled", "no_suitable_address"} {
+				for _, ipv := range []string{"ip4", "ip6"} {
+					for _, transport := range []string{"quic", "quic-v1", "tcp", "webtransport"} {
+						hpAddressOutcomesTotal.WithLabelValues(side, numAttempts, ipv, transport, outcome)
+					}
+				}
+				hpOutcomesTotal.WithLabelValues(side, numAttempts, outcome)
+			}
+		}
+	}
 	return &metricsTracer{}
 }