[VOL-4442] grpc streaming connection monitoring

Change-Id: Ifc904d3d146696937cf5e4e7427fbb4d5ff45da0
diff --git a/pkg/probe/probe.go b/pkg/probe/probe.go
index 84a2d5f..7ba1a57 100644
--- a/pkg/probe/probe.go
+++ b/pkg/probe/probe.go
@@ -275,6 +275,8 @@
 }
 
 func (p *Probe) IsReady() bool {
+	p.mutex.RLock()
+	defer p.mutex.RUnlock()
 	return p.isReady
 }