feat(core): track only last timestamp of when sub was stuck

core/listener.go

@@ -102,7 +102,7 @@ func (cl *Listener) Start(context.Context) error {
 func (cl *Listener) Stop(context.Context) error {
 	cl.cancel()
 	cl.cancel = nil
-	return nil
+	return cl.metrics.Close()
 }
 
 // runSubscriber runs a subscriber to receive event data of new signed blocks. It will attempt to

core/metrics.go

@@ -5,18 +5,19 @@ import (
 	"time"
 
 	"go.opentelemetry.io/otel"
-	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
 )
 
 var meter = otel.Meter("core")
 
-var subscriptionStuckTimestampKey = "subscription_stuck_timestamp"
-
 type metrics struct {
 	blockTime     time.Time
 	blockTimeInst metric.Float64Histogram
 
+	lastTimeSubscriptionStuck     time.Time
+	lastTimeSubscriptionStuckInst metric.Int64Observable
+	lastTimeSubscriptionStuckReg  metric.Registration
+
 	subscriptionStuckInst metric.Int64Counter
 }
 
@@ -40,6 +41,14 @@ func newMetrics() (*metrics, error) {
 		return nil, err
 	}
 
+	m.lastTimeSubscriptionStuckReg, err = meter.RegisterCallback(
+		m.observeLastTimeStuckCallback,
+		m.lastTimeSubscriptionStuckInst,
+	)
+	if err != nil {
+		return nil, err
+	}
+
 	return m, nil
 }
 
@@ -69,10 +78,19 @@ func (m *metrics) observeBlockTime(ctx context.Context) {
 
 func (m *metrics) subscriptionStuck(ctx context.Context) {
 	m.observe(ctx, func(ctx context.Context) {
-		m.subscriptionStuckInst.Add(
-			ctx,
-			1,
-			metric.WithAttributes(attribute.String(subscriptionStuckTimestampKey, time.Now().String())),
-		)
+		m.subscriptionStuckInst.Add(ctx, 1)
 	})
 }
+
+func (m *metrics) observeLastTimeStuckCallback(_ context.Context, obs metric.Observer) error {
+	obs.ObserveInt64(m.lastTimeSubscriptionStuckInst, m.lastTimeSubscriptionStuck.Unix())
+	return nil
+}
+
+func (m *metrics) Close() error {
+	if m == nil {
+		return nil
+	}
+
+	return m.lastTimeSubscriptionStuckReg.Unregister()
+}

nodebuilder/p2p/addrs.go

@@ -2,11 +2,11 @@ package p2p
 
 import (
 	"fmt"
-	"slices"
 
 	p2pconfig "github.com/libp2p/go-libp2p/config"
 	hst "github.com/libp2p/go-libp2p/core/host"
 	ma "github.com/multiformats/go-multiaddr"
+	"slices"
 )
 
 // Listen returns invoke function that starts listening for inbound connections with libp2p.Host.