{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Ably Attachment Event",
  "type": "object",
  "properties": {
    "connectionId": {
      "type": "string",
      "description": "The ID of the connection"
    },
    "site": {
      "type": "string",
      "description": "The site in which the attachment was established"
    },
    "channelId": {
      "type": "string",
      "description": "The ID of the channel"
    },
    "channelName": {
      "type": "string",
      "description": "The name of the channel"
    },
    "qualifier": {
      "type": "string",
      "description": "The qualifier used in the channel spec"
    },
    "qualifierParam": {
      "type": "string",
      "description": "The parameter for the qualifier used in the channel spec"
    },
    "channelParams": {
      "type": "object",
      "description": "Channel parameters",
      "properties": {
        "delta": {
          "type": "string",
          "description": "Channel delta parameter",
          "enum": ["vcdiff"]
        },
        "rewind": {
          "type": "string",
          "description": "Channel rewind parameter"
        },
        "mode": {
          "type": "string",
          "description": "Channel mode parameter, a comma-separated list of channel modes"
        },
        "occupancy": {
          "type": "string",
          "description": "Channel occupancy parameter",
          "enum": [
            "metrics",
            "metrics.connections",
            "metrics.publishers",
            "metrics.subscribers",
            "metrics.presenceConnections",
            "metrics.presenceMembers",
            "metrics.presenceSubscribers",
            "metrics.stateSubscribers",
            "metrics.statePublishers"
          ]
        }
      }
    },
    "duration": {
      "type": "integer",
      "description": "The duration the attachment was open for in milliseconds"
    },
    "messages": {
      "type": "object",
      "description": "Message statistics",
      "properties": {
        "inbound": {
          "type": "object",
          "description": "Number of inbound messages",
          "properties": {
            "messages": {
              "type": "object",
              "description": "Message statistics",
              "properties": {
                "count": {
                  "type": "integer",
                  "description": "Message count"
                },
                "data": {
                  "type": "integer",
                  "description": "Message data in bytes"
                }
              }
            },
            "presence": {
              "type": "object",
              "description": "Message statistics",
              "properties": {
                "count": {
                  "type": "integer",
                  "description": "Message count"
                },
                "data": {
                  "type": "integer",
                  "description": "Message data in bytes"
                }
              }
            }
          }
        },
        "outbound": {
          "type": "object",
          "description": "Number of outbound messages",
          "properties": {
            "messages": {
              "type": "object",
              "description": "Message statistics",
              "properties": {
                "count": {
                  "type": "integer",
                  "description": "Message count"
                },
                "data": {
                  "type": "integer",
                  "description": "Message data in bytes"
                }
              }
            },
            "presence": {
              "type": "object",
              "description": "Message statistics",
              "properties": {
                "count": {
                  "type": "integer",
                  "description": "Message count"
                },
                "data": {
                  "type": "integer",
                  "description": "Message data in bytes"
                }
              }
            }
          }
        }
      }
    },
    "filter": {
      "type": "object",
      "description": "Filtered channel statistics",
      "properties": {
        "messagesReceived": {
          "type": "integer",
          "description": "The number of messages received by the filtered channel (including filtered messages)"
        },
        "messagesAccepted": {
          "type": "integer",
          "description": "The number of messages that pass the channels filter"
        }
      }
    }
  },
  "additionalProperties": false,
  "required": ["connectionId", "site", "channelId", "channelName", "duration"]
}