Rollbar grouping config to include the exception message for node.js errors with class name 'Error'

example.json

[{
  "condition": {"all": [
    {"path": "body.trace.exception.class", "eq": "Error"},
    {"path": "framework", "eq": "node-js"}
  ]},
  "title": "{{default_title}}",
  "fingerprint": "{{default_fingerprint}}-{{body.trace.exception.message}}"
}]