test: cover daemon telemetry publication

cmd/rvbox-server/main.go

@@ -245,15 +245,7 @@ func publishServerTelemetry(ctx context.Context, persistence *store.Store, healt
 	ticker := time.NewTicker(10 * time.Second)
 	defer ticker.Stop()
 	for {
-		sampleContext, cancel := context.WithTimeout(ctx, time.Second)
-		telemetry, err := persistence.Telemetry(sampleContext)
-		cancel()
-		if err != nil {
-			health.Inc("telemetry_read_failure")
-		} else {
-			health.SetGauge("queue_depth", float64(telemetry.QueuedCommands))
-			health.SetGauge("server_charged_bytes", float64(telemetry.ChargedBytes))
-		}
+		publishServerTelemetrySample(ctx, persistence.Telemetry, health)
 		select {
 		case <-ctx.Done():
 			return
@@ -261,3 +253,18 @@ func publishServerTelemetry(ctx context.Context, persistence *store.Store, healt
 		}
 	}
 }
+
+// publishServerTelemetrySample performs one intentionally bounded, best-effort
+// telemetry read. A failed metrics read must never affect server readiness or
+// durable command processing.
+func publishServerTelemetrySample(ctx context.Context, read func(context.Context) (store.Telemetry, error), health *observability.Health) {
+	sampleContext, cancel := context.WithTimeout(ctx, time.Second)
+	telemetry, err := read(sampleContext)
+	cancel()
+	if err != nil {
+		health.Inc("telemetry_read_failure")
+		return
+	}
+	health.SetGauge("queue_depth", float64(telemetry.QueuedCommands))
+	health.SetGauge("server_charged_bytes", float64(telemetry.ChargedBytes))
+}