Stream Record

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/streaming/main/json-schema/streaming-stream-record-schema.json",
  "title": "Stream Record",
  "description": "An envelope describing a single record on a stream — the unit of data that producers append and consumers read. Generalizes Kafka ProducerRecord/ConsumerRecord, Pulsar Message, Kinesis Record, and Pub/Sub PubsubMessage.",
  "type": "object",
  "required": ["stream", "partition", "offset", "value"],
  "properties": {
    "stream": {
      "type": "string",
      "description": "Identifier of the stream / topic this record belongs to."
    },
    "partition": {
      "type": ["integer", "string"],
      "description": "Partition / shard identifier the record was written to."
    },
    "offset": {
      "type": ["integer", "string"],
      "description": "Position of the record within the partition (integer offset, Pulsar MessageId, Kinesis sequence number, Pub/Sub message id)."
    },
    "key": {
      "type": ["string", "null"],
      "description": "Optional record key used for partition assignment and log-compaction identity. Null indicates an unkeyed record."
    },
    "value": {
      "description": "Record payload. May be a JSON object, a base64-encoded binary blob, or a string, depending on encoding.",
      "oneOf": [
        { "type": "object" },
        { "type": "string" },
        { "type": "array" },
        { "type": "null" }
      ]
    },
    "value_encoding": {
      "type": "string",
      "enum": ["json", "avro", "protobuf", "text", "base64"],
      "description": "How the value field is encoded."
    },
    "headers": {
      "type": "object",
      "description": "User-supplied metadata key/value pairs attached to the record.",
      "additionalProperties": { "type": "string" }
    },
    "event_time": {
      "type": "string",
      "format": "date-time",
      "description": "When the event actually occurred, per the producer."
    },
    "ingestion_time": {
      "type": "string",
      "format": "date-time",
      "description": "When the streaming platform appended the record."
    },
    "schema_id": {
      "type": ["string", "integer"],
      "description": "Schema Registry id used to deserialize the value."
    },
    "transaction_id": {
      "type": "string",
      "description": "Producer transaction id for transactional writes (exactly-once)."
    },
    "trace_context": {
      "type": "object",
      "description": "OpenTelemetry / W3C Trace Context propagated via headers.",
      "properties": {
        "traceparent": { "type": "string" },
        "tracestate": { "type": "string" }
      }
    }
  }
}