AUE_UNMOUNT

{
  "_event_score": 0,
  "attributes": {
    "device": 0,
    "file_access_mode": 16877,
    "file_system_id": 16777224,
    "node_id": 2,
    "owner_group_id": 0,
    "owner_group_name": "wheel",
    "owner_user_id": 0,
    "owner_user_name": "root"
  },
  "exec_chain_child": {
    "parent_path": "/usr/libexec/diskarbitrationd",
    "parent_pid": 229,
    "parent_uuid": "BE5CF774-ABEA-44AB-B38A-D33C8BF13EC4"
  },
  "header": {
    "event_id": 56,
    "event_modifier": 0,
    "event_name": "AUE_UNMOUNT",
    "time_milliseconds_offset": 441,
    "time_seconds_epoch": 1571161051,
    "version": 11
  },
  "host_info": {
    "host_name": "Dan_macbook_pro",
    "host_uuid": "3F6E4B3A-9285-4E7E-9A0C-C3B62DC379DF",
    "osversion": "Version 10.15 (Build 19A582a)",
    "primary_mac_address": "38:f9:e8:15:5a:82",
    "serial_number": "C03XY889JHG3"
  },
  "identity": {
    "cd_hash": "cf57b45efd63818602eb1e833caeb34baa0358b9",
    "signer_id": "com.apple.umount",
    "signer_id_truncated": 0,
    "signer_type": 1,
    "team_id": "",
    "team_id_truncated": 0
  },
  "path": [
    "/Volumes/Recovery",
    "/Volumes/Recovery"
  ],
  "return": {
    "description": "success",
    "error": 0,
    "return_value": 0
  },
  "subject": {
    "audit_id": 4294967295,
    "audit_user_name": "-1",
    "effective_group_id": 0,
    "effective_group_name": "wheel",
    "effective_user_id": 0,
    "effective_user_name": "root",
    "group_id": 0,
    "group_name": "wheel",
    "process_hash": "",
    "process_id": 19730,
    "process_name": "",
    "session_id": 100000,
    "terminal_id": {
      "addr": [
        0
      ],
      "ip_address": "0.0.0.0",
      "port": 0,
      "type": 0
    },
    "user_id": 0,
    "user_name": "root"
  }
}