What attributes from Kafka can a consumer read from a message, besides the body itself?

Besides the message body (payload), a Kafka consumer can read the following message metadata:

• Message key (key) — used to determine the partition and routing logic.
• Topic (topic) — the name of the topic from which the message was read.
• Partition (partition) — the partition number within the topic.
• Offset (offset) — the position of the message within the partition, a unique identifier for reading.
• Timestamp (timestamp) — the creation or logging time of the message.
• Headers (headers) — arbitrary key-value pairs that can be used to pass additional information.

Example of obtaining these metadata in Java:

ConsumerRecord<String, String> record = ...; // received message
String key = record.key();
String value = record.value();
String topic = record.topic();
int partition = record.partition();
long offset = record.offset();
long timestamp = record.timestamp();
Headers headers = record.headers();