notifier/notifier.go [724:757]:
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		addPort := func(s string) bool {
			// If we can split, a port exists and we don't have to add one.
			if _, _, err := net.SplitHostPort(s); err == nil {
				return false
			}
			// If adding a port makes it valid, the previous error
			// was not due to an invalid address and we can append a port.
			_, _, err := net.SplitHostPort(s + ":1234")
			return err == nil
		}
		addr := lset.Get(model.AddressLabel)
		// If it's an address with no trailing port, infer it based on the used scheme.
		if addPort(addr) {
			// Addresses reaching this point are already wrapped in [] if necessary.
			switch lset.Get(model.SchemeLabel) {
			case "http", "":
				addr = addr + ":80"
			case "https":
				addr = addr + ":443"
			default:
				return nil, nil, errors.Errorf("invalid scheme: %q", cfg.Scheme)
			}
			lb.Set(model.AddressLabel, addr)
		}

		if err := config.CheckTargetAddress(model.LabelValue(addr)); err != nil {
			return nil, nil, err
		}

		// Meta labels are deleted after relabelling. Other internal labels propagate to
		// the target which decides whether they will be part of their label set.
		for _, l := range lset {
			if strings.HasPrefix(l.Name, model.MetaLabelPrefix) {
				lb.Del(l.Name)
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scrape/target.go [382:415]:
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	addPort := func(s string) bool {
		// If we can split, a port exists and we don't have to add one.
		if _, _, err := net.SplitHostPort(s); err == nil {
			return false
		}
		// If adding a port makes it valid, the previous error
		// was not due to an invalid address and we can append a port.
		_, _, err := net.SplitHostPort(s + ":1234")
		return err == nil
	}
	addr := lset.Get(model.AddressLabel)
	// If it's an address with no trailing port, infer it based on the used scheme.
	if addPort(addr) {
		// Addresses reaching this point are already wrapped in [] if necessary.
		switch lset.Get(model.SchemeLabel) {
		case "http", "":
			addr = addr + ":80"
		case "https":
			addr = addr + ":443"
		default:
			return nil, nil, errors.Errorf("invalid scheme: %q", cfg.Scheme)
		}
		lb.Set(model.AddressLabel, addr)
	}

	if err := config.CheckTargetAddress(model.LabelValue(addr)); err != nil {
		return nil, nil, err
	}

	// Meta labels are deleted after relabelling. Other internal labels propagate to
	// the target which decides whether they will be part of their label set.
	for _, l := range lset {
		if strings.HasPrefix(l.Name, model.MetaLabelPrefix) {
			lb.Del(l.Name)
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