add metrics

management/server/update_buffer.go

@@ -3,17 +3,20 @@ package server
 import (
 	"context"
 	"sync"
+
+	"github.com/netbirdio/netbird/management/server/telemetry"
 )
 
 type UpdateBuffer struct {
-	mu     sync.Mutex
-	cond   *sync.Cond
-	update *UpdateMessage
-	closed bool
+	mu      sync.Mutex
+	cond    *sync.Cond
+	update  *UpdateMessage
+	closed  bool
+	metrics *telemetry.UpdateChannelMetrics
 }
 
-func NewUpdateBuffer() *UpdateBuffer {
-	ub := &UpdateBuffer{}
+func NewUpdateBuffer(metrics *telemetry.UpdateChannelMetrics) *UpdateBuffer {
+	ub := &UpdateBuffer{metrics: metrics}
 	ub.cond = sync.NewCond(&ub.mu)
 	return ub
 }
@@ -22,11 +25,22 @@ func (b *UpdateBuffer) Push(update *UpdateMessage) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 
-	// the equal case we need because we don't always increment the serial number
-	if b.update == nil || update.NetworkMap.Network.Serial >= b.update.NetworkMap.Network.Serial {
+	if b.update == nil {
 		b.update = update
 		b.cond.Signal()
+		b.metrics.CountBufferPush()
+		return
 	}
+
+	// the equal case we need because we don't always increment the serial number
+	if update.NetworkMap.Network.Serial >= b.update.NetworkMap.Network.Serial {
+		b.update = update
+		b.cond.Signal()
+		b.metrics.CountBufferOverwrite()
+		return
+	}
+
+	b.metrics.CountBufferIgnore()
 }
 
 func (b *UpdateBuffer) Pop(ctx context.Context) (*UpdateMessage, bool) {