in v2/metrics/sender/types.go [110:119]
func (i *Informer) GetSendMessageFailureCount() (float64, error) {
var total float64
common.Collect(i.registry.MessageSentCount, func(m *dto.Metric) {
if !common.HasLabel(m, successLabel, "false") {
return
}
total += m.GetCounter().GetValue()
})
return total, nil
}