{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/MeteringEvent",
  "title": "Metering Event",
  "description": "Metering event following the CloudEvents specification.",
  "type": "object",
  "properties": {
    "id": {
      "description": "Identifies the event.",
      "type": "string",
      "example": "5c10fade-1c9e-4d6c-8275-c52c36731d3c",
      "minLength": 1
    },
    "source": {
      "description": "Identifies the context in which an event happened.",
      "type": "string",
      "format": "uri-reference",
      "example": "service-name",
      "minLength": 1
    },
    "specversion": {
      "description": "The version of the CloudEvents specification which the event uses.",
      "type": "string",
      "example": "1.0",
      "default": "1.0",
      "minLength": 1
    },
    "type": {
      "description": "Contains a value describing the type of event related to the originating occurrence.",
      "type": "string",
      "example": "com.example.someevent",
      "minLength": 1
    },
    "datacontenttype": {
      "description": "Content type of the CloudEvents data value. Only the value \"application/json\" is allowed over HTTP.",
      "type": "string",
      "example": "application/json",
      "enum": [
        "application/json"
      ],
      "nullable": true
    },
    "dataschema": {
      "description": "Identifies the schema that data adheres to.",
      "type": "string",
      "format": "uri",
      "minLength": 1,
      "nullable": true
    },
    "subject": {
      "description": "Describes the subject of the event in the context of the event producer (identified by source).",
      "type": "string",
      "example": "customer-id",
      "minLength": 1
    },
    "time": {
      "description": "Timestamp of when the occurrence happened. Must adhere to RFC 3339.",
      "type": "string",
      "format": "date-time",
      "example": "2023-01-01T01:01:01.001Z",
      "nullable": true,
      "title": "RFC3339 Date-Time"
    },
    "data": {
      "description": "The event payload.\nOptional, if present it must be a JSON object.",
      "type": "object",
      "additionalProperties": {},
      "nullable": true
    }
  },
  "example": {
    "specversion": "1.0",
    "id": "5c10fade-1c9e-4d6c-8275-c52c36731d3c",
    "source": "service-name",
    "type": "prompt",
    "subject": "customer-id",
    "time": "2023-01-01T01:01:01.001Z",
    "data": {
      "prompt": "Hello, world!",
      "tokens": 100,
      "model": "gpt-4o",
      "type": "input"
    }
  },
  "required": [
    "id",
    "source",
    "specversion",
    "type",
    "subject"
  ]
}