if rootDiskSize != "" {
		size, err := humanize.ParseBytes(rootDiskSize)
		if err != nil {
			logger.Fatal(err, fmt.Sprintf("Invalid %s value in root drive threshold environment variable", rootDiskSize))
		}
		globalRootDiskThreshold = size
	}

	domains := env.Get(config.EnvDomain, "")
	if len(domains) != 0 {
		for domainName := range strings.SplitSeq(domains, config.ValueSeparator) {
			if _, ok := dns2.IsDomainName(domainName); !ok {