const (
	KafkaBrokers            = "brokers"
	KafkaTopic              = "topic"
	KafkaQueueDir           = "queue_dir"
	KafkaQueueLimit         = "queue_limit"
	KafkaTLS                = "tls"
	KafkaTLSSkipVerify      = "tls_skip_verify"
	KafkaTLSClientAuth      = "tls_client_auth"
	KafkaSASL               = "sasl"
	KafkaSASLUsername       = "sasl_username"
	KafkaSASLPassword       = "sasl_password"
	KafkaSASLMechanism      = "sasl_mechanism"

	Password          string    `json:"password"`
	Token             string    `json:"token"`
	NKeySeed          string    `json:"nKeySeed"`
	TLS               bool      `json:"tls"`
	TLSSkipVerify     bool      `json:"tlsSkipVerify"`
	TLSHandshakeFirst bool      `json:"tlsHandshakeFirst"`
	Secure            bool      `json:"secure"`
	CertAuthority     string    `json:"certAuthority"`
	ClientCert        string    `json:"clientCert"`

	RetryInterval = "retry_interval"
	Proxy         = "proxy"
	httpTimeout   = "http_timeout"

	KafkaBrokers       = "brokers"
	KafkaTopic         = "topic"
	KafkaTLS           = "tls"
	KafkaTLSSkipVerify = "tls_skip_verify"
	KafkaTLSClientAuth = "tls_client_auth"
	KafkaSASL          = "sasl"
	KafkaSASLUsername  = "sasl_username"
	KafkaSASLPassword  = "sasl_password"
	KafkaSASLMechanism = "sasl_mechanism"

tls_client_auth  (string)    clientAuth determines the Kafka server's policy for TLS client auth
sasl             (on|off)    set to 'on' to enable SASL authentication
tls              (on|off)    set to 'on' to enable TLS
tls_skip_verify  (on|off)    trust server TLS without verification, defaults to "on" (verify)
client_tls_cert  (path)      path to client certificate for mTLS auth
client_tls_key   (path)      path to client key for mTLS auth

			Token:             env.Get(tokenEnv, kv.Get(target.NATSToken)),
			NKeySeed:          env.Get(nKeySeedEnv, kv.Get(target.NATSNKeySeed)),
			TLS:               env.Get(tlsEnv, kv.Get(target.NATSTLS)) == config.EnableOn,
			TLSSkipVerify:     env.Get(tlsSkipVerifyEnv, kv.Get(target.NATSTLSSkipVerify)) == config.EnableOn,
			TLSHandshakeFirst: env.Get(tlsHandshakeFirstEnv, kv.Get(target.NATSTLSHandshakeFirst)) == config.EnableOn,
			PingInterval:      pingInterval,