| Name | Description | Default value |
| client_id | Client identifier. May be an arbitrary string. Optional, but you should set this property on each instance because it enables you to more easily correlate requests on the broker with the client instance which made it, which can be helpful in debugging and troubleshooting scenarios. | userver |
| delivery_timeout | Time a produced message waits for successful delivery. | – |
| queue_buffering_max | Delay to wait for messages to be transmitted to broker. | – |
| enable_idempotence | Whether to make producer idempotent. | false |
| queue_buffering_max_messages | Maximum number of messages allowed on the producer queue. In other words, maximum number of simultaneously send requests waiting for delivery. | 100000 |
| queue_buffering_max_kbytes | Maximum total message size sum allowed on the producer queue. Has higher priority than queue_buffering_max_messages, i.e. if this limit is exceeded no more send requests are accepted regardless to the number of messages. | 1048576 |
| message_max_bytes | One message maximum size. | 1000000 |
| message_send_max_retries | Maximum number of send request retries until delivery_timeout reached. | 2147483647 |
| retry_backoff | The backoff time before retrying a producer send request. It will be backed off exponentially until number of retries is exhausted and bounded by retry_backoff_max. The backoff must fit in [1ms; 300000ms]. | 100ms |
| retry_backoff_max | Backoff upper bound. The backoff must fit in [1ms; 300000ms]. | 1000ms |
| security_protocol | Protocol used to communicate with brokers. Possible values: PLAINTEXT, SASL_SSL, SASL_PLAINTEXT, SSL. | – |
| sasl_mechanisms | SASL mechanism to use for authentication. Must be set if security_protocol equals SASL_SSL. Possible values: PLAIN, SCRAM-SHA-512. | none |
| ssl_ca_location | File or directory path to CA certificate(s) for verifying the broker's key. Must be set if security_protocol equals SASL_SSL or SSL. If set to probe, CA certificates are probed from the default certificates paths. | none |
| rd_kafka_custom_options.* | A map of arbitrary librdkafka library configuration options. Full list of options is available by link: https://github.com/confluentinc/librdkafka/blob/master/CONFIGURATION.md. Note: This options is not guaranteed to be supported in userver-kafka, use it at your own risk. Each of the elements: librdkafka option value. | {} |
| debug_info_log_level | Log level for everything debug information. | debug |
| operation_log_level | Log level for infos about ordinary actions. | debug |
