fluent/fluent.go
func (f *Fluent) IsReconnecting() bool {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.reconnecting
}
func (f *Fluent) IsReconnecting() bool {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.reconnecting
}
// IsReconnecting return true if a reconnecting process in progress.