Apache Pulsar Pulsar Message Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/apache-pulsar/refs/heads/main/json-structure/apache-pulsar-pulsar-message-structure.json",
  "description": "Schema for an Apache Pulsar message including metadata and payload.",
  "type": "object",
  "properties": {
    "messageId": {
      "type": "string",
      "description": "Unique message ID in format ledgerId:entryId:partitionIndex"
    },
    "payload": {
      "description": "The message payload, encoded according to the topic schema"
    },
    "key": {
      "type": "string",
      "description": "Message key used for topic compaction and Key_Shared subscriptions"
    },
    "orderingKey": {
      "type": "string",
      "description": "Ordering key for Key_Shared subscription ordering"
    },
    "properties": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      },
      "description": "User-defined key-value properties attached to the message"
    },
    "publishTime": {
      "type": "datetime",
      "description": "Timestamp when the message was published"
    },
    "eventTime": {
      "type": "datetime",
      "description": "Application-defined event time"
    },
    "sequenceId": {
      "type": "int32",
      "description": "Sequence ID for deduplication"
    },
    "producerName": {
      "type": "string",
      "description": "Name of the producer that published the message"
    },
    "redeliveryCount": {
      "type": "int32",
      "description": "Number of times the message has been redelivered"
    },
    "schemaVersion": {
      "type": "string",
      "description": "Schema version used to encode the message"
    },
    "topic": {
      "type": "string",
      "description": "Full topic name (persistent://tenant/namespace/topic)"
    }
  },
  "name": "PulsarMessage"
}