log root cause error when reading from provisioning directories

pkg/services/provisioning/dashboards/config_reader.go

@@ -59,7 +59,7 @@ func (cr *configReader) readConfig() ([]*DashboardsAsConfig, error) {
 
 	files, err := ioutil.ReadDir(cr.path)
 	if err != nil {
-		cr.log.Error("can't read dashboard provisioning files from directory", "path", cr.path)
+		cr.log.Error("can't read dashboard provisioning files from directory", "path", cr.path, "error", err)
 		return dashboards, nil
 	}
 

pkg/services/provisioning/datasources/config_reader.go

@@ -19,7 +19,7 @@ func (cr *configReader) readConfig(path string) ([]*DatasourcesAsConfig, error)
 
 	files, err := ioutil.ReadDir(path)
 	if err != nil {
-		cr.log.Error("can't read datasource provisioning files from directory", "path", path)
+		cr.log.Error("can't read datasource provisioning files from directory", "path", path, "error", err)
 		return datasources, nil
 	}
 

pkg/services/provisioning/notifiers/config_reader.go

@@ -23,7 +23,7 @@ func (cr *configReader) readConfig(path string) ([]*notificationsAsConfig, error
 
 	files, err := ioutil.ReadDir(path)
 	if err != nil {
-		cr.log.Error("Can't read alert notification provisioning files from directory", "path", path)
+		cr.log.Error("Can't read alert notification provisioning files from directory", "path", path, "error", err)
 		return notifications, nil
 	}