MESH-000-Cache log add (#980)

* MESH-0000: Add Len() method to caches and log cache lengths in controllers

* MESH-0000: Add Len() method to caches and log cache lengths in controllers (#978)

Co-authored-by: pchaand <[email protected]>

* MESH-0000: Add Len() method to mock caches in virtualservice tests

---------

Co-authored-by: pchaand <[email protected]>

Author: Punakshi Chaand

admiral/pkg/controller/istio/virtualservice_test.go

@@ -1279,6 +1279,9 @@ func (m *MockVirtualServiceCache) GetVSProcessStatus(*v1alpha3.VirtualService) s
 func (m *MockVirtualServiceCache) UpdateVSProcessStatus(*v1alpha3.VirtualService, string) error {
 	return m.Error
 }
+func (m *MockVirtualServiceCache) Len() int {
+	return 0
+}
 
 type MockIdentityNamespaceVirtualServiceCache struct {
 }
@@ -1292,3 +1295,6 @@ func (m MockIdentityNamespaceVirtualServiceCache) Delete(*v1alpha3.VirtualServic
 func (m MockIdentityNamespaceVirtualServiceCache) Get(string) map[string]*v1alpha3.VirtualService {
 	return nil
 }
+func (m MockIdentityNamespaceVirtualServiceCache) Len() int {
+	return 0
+}