json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "$id": "docs/spec/stacktrace.json",
      "title": "Stacktrace",
      "type": "object",
      "description": "A stacktrace frame, contains various bits (most optional) describing the context of the frame",
      "properties": {
          "abs_path": {
              "description": "The absolute path of the file involved in the stack frame",
              "type": [
                  "string",
                  "null"
              ]
          },
          "colno": {
              "description": "Column number",
              "type": [
                  "number",
                  "null"
              ]
          },
          "context_line": {
              "description": "The line of code part of the stack frame",
              "type": [
                  "string",
                  "null"
              ]
          },
          "filename": {
              "description": "The relative filename of the code involved in the stack frame, used e.g. to do error checksumming",
              "type": "string"
          },
          "function": {
              "description": "The function involved in the stack frame",
              "type": [
                  "string",
                  "null"
              ]
          },
          "in_app": {
              "type": [
                  "boolean",
                  "null"
              ]
          },
          "lineno": {
              "description": "The line number of code part of the stack frame, used e.g. to do error checksumming",
              "type": "number"
          },
          "module": {
              "description": "The module to which frame belongs to",
              "type": [
                  "string",
                  "null"
              ]
          },
          "post_context": {
              "description": "The lines of code after the stack frame",
              "type": [
                  "array",
                  "null"
              ],
              "minItems": 0
          },
          "pre_context": {
              "description": "The lines of code before the stack frame",
              "type": [
                  "array",
                  "null"
              ],
              "minItems": 0
          },
          "vars": {
              "description": "Local variables for this stack frame",
              "type": [
                  "object",
                  "null"
              ],
              "properties": {}
          }
      },
      "required": [
          "filename",
          "lineno"
      ]
  }