stacktrace property in v2 error spec should list properties under items property

[russcam]

The properties of each frame in a stacktrace are listed as properties of the stacktrace:

apm-server/docs/spec/v2/error.json

Lines 635 to 734 in be85ba7

	"stacktrace": {
	"description": "Stacktrace information of the captured exception.",
	"type": [
	"null",
	"array"
	],
	"properties": {
	"abs_path": {
	"description": "AbsPath is the absolute path of the frame's file.",
	"type": [
	"null",
	"string"
	]
	},
	"classname": {
	"description": "Classname of the frame.",
	"type": [
	"null",
	"string"
	]
	},
	"colno": {
	"description": "ColumnNumber of the frame.",
	"type": [
	"null",
	"integer"
	]
	},
	"context_line": {
	"description": "ContextLine is the line from the frame's file.",
	"type": [
	"null",
	"string"
	]
	},
	"filename": {
	"description": "Filename is the relative name of the frame's file.",
	"type": [
	"null",
	"string"
	]
	},
	"function": {
	"description": "Function represented by the frame.",
	"type": [
	"null",
	"string"
	]
	},
	"library_frame": {
	"description": "LibraryFrame indicates whether the frame is from a third party library.",
	"type": [
	"null",
	"boolean"
	]
	},
	"lineno": {
	"description": "LineNumber of the frame.",
	"type": [
	"null",
	"integer"
	]
	},
	"module": {
	"description": "Module to which the frame belongs to.",
	"type": [
	"null",
	"string"
	]
	},
	"post_context": {
	"description": "PostContext is a slice of code lines immediately before the line from the frame's file.",
	"type": [
	"null",
	"array"
	],
	"items": {
	"type": "string"
	},
	"minItems": 0
	},
	"pre_context": {
	"description": "PreContext is a slice of code lines immediately after the line from the frame's file.",
	"type": [
	"null",
	"array"
	],
	"items": {
	"type": "string"
	},
	"minItems": 0
	},
	"vars": {
	"description": "Vars is a flat mapping of local variables of the frame.",
	"type": [
	"null",
	"object"
	]
	}
	},

It looks like these should be listed as properties of the items schema (the frames) of a stacktrace i.e.

"stacktrace": {
    "description": "Stacktrace information of the captured exception.",
    "type": [
        "null",
        "array"
    ],
    "items": {
        "type": "object",
        "properties": {
            "abs_path": {
                "description": "AbsPath is the absolute path of the frame's file.",
                "type": [
                    "null",
                    "string"
                ]
            },
            "classname": {
                "description": "Classname of the frame.",
                "type": [
                    "null",
                    "string"
                ]
            },
            "colno": {
                "description": "ColumnNumber of the frame.",
                "type": [
                    "null",
                    "integer"
                ]
            },
            "context_line": {
                "description": "ContextLine is the line from the frame's file.",
                "type": [
                    "null",
                    "string"
                ]
            },
            "filename": {
                "description": "Filename is the relative name of the frame's file.",
                "type": [
                    "null",
                    "string"
                ]
            },
            "function": {
                "description": "Function represented by the frame.",
                "type": [
                    "null",
                    "string"
                ]
            },
            "library_frame": {
                "description": "LibraryFrame indicates whether the frame is from a third party library.",
                "type": [
                    "null",
                    "boolean"
                ]
            },
            "lineno": {
                "description": "LineNumber of the frame.",
                "type": [
                    "null",
                    "integer"
                ]
            },
            "module": {
                "description": "Module to which the frame belongs to.",
                "type": [
                    "null",
                    "string"
                ]
            },
            "post_context": {
                "description": "PostContext is a slice of code lines immediately before the line from the frame's file.",
                "type": [
                    "null",
                    "array"
                ],
                "items": {
                    "type": "string"
                },
                "minItems": 0
            },
            "pre_context": {
                "description": "PreContext is a slice of code lines immediately after the line from the frame's file.",
                "type": [
                    "null",
                    "array"
                ],
                "items": {
                    "type": "string"
                },
                "minItems": 0
            },
            "vars": {
                "description": "Vars is a flat mapping of local variables of the frame.",
                "type": [
                    "null",
                    "object"
                ]
            }
        },
        "anyOf": [
            {
                "properties": {
                    "classname": {
                        "type": "string"
                    }
                },
                "required": [
                    "classname"
                ]
            },
            {
                "properties": {
                    "filename": {
                        "type": "string"
                    }
                },
                "required": [
                    "filename"
                ]
            }
        ]
    },
    "minItems": 0
},