json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "definitions": {
          "sourceType": {
              "type": "string",
              "enum": [
                  "flow",
                  "user",
                  "device"
              ]
          },
          "level": {
              "type": "string",
              "enum": [
                  "info",
                  "warning",
                  "error",
                  "critical"
              ]
          },
          "state": {
              "type": "string",
              "enum": [
                  "new",
                  "acknowledged",
                  "resolved"
              ]
          },
          "subject": {
              "type": "string",
              "minLength": 1,
              "maxLength": 255
          },
          "message": {
              "type": "string"
          }
      },
      "properties": {
          "id": {
              "type": "string",
              "pattern": "^[A-Fa-f\\d]{24}$"
          },
          "eventId": {
              "type": "string",
              "pattern": "^[A-Fa-f\\d]{24}$"
          },
          "applicationId": {
              "type": "string",
              "pattern": "^[A-Fa-f\\d]{24}$"
          },
          "creationDate": {
              "type": "string",
              "format": "date-time"
          },
          "lastUpdated": {
              "type": "string",
              "format": "date-time"
          },
          "sourceType": {
              "$ref": "#/definitions/sourceType"
          },
          "sourceId": {
              "type": "string",
              "pattern": "^[A-Fa-f\\d]{24}$"
          },
          "level": {
              "$ref": "#/definitions/level"
          },
          "state": {
              "$ref": "#/definitions/state"
          },
          "subject": {
              "$ref": "#/definitions/subject"
          },
          "message": {
              "$ref": "#/definitions/message"
          }
      }
  }