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"

	UserCredentials string    `json:"userCredentials"`
	Password        string    `json:"password"`
	Token           string    `json:"token"`
	TLS             bool      `json:"tls"`
	TLSSkipVerify   bool      `json:"tlsSkipVerify"`
	Secure          bool      `json:"secure"`
	CertAuthority   string    `json:"certAuthority"`
	ClientCert      string    `json:"clientCert"`
	ClientKey       string    `json:"clientKey"`

	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

			ClientKey:       env.Get(clientKeyEnv, kv.Get(target.NATSClientKey)),
			Token:           env.Get(tokenEnv, kv.Get(target.NATSToken)),
			TLS:             env.Get(tlsEnv, kv.Get(target.NATSTLS)) == config.EnableOn,
			TLSSkipVerify:   env.Get(tlsSkipVerifyEnv, kv.Get(target.NATSTLSSkipVerify)) == config.EnableOn,
			PingInterval:    pingInterval,
			QueueDir:        env.Get(queueDirEnv, kv.Get(target.NATSQueueDir)),
			QueueLimit:      queueLimit,