OptionaldataContains a dictionary whose contents depend on the breadcrumb type. Additional parameters that are unsupported by the type are rendered as a key/value table.
Optionalevent_OptionallevelAllowed values are, from highest to lowest:
fatal, error, warning, info, and debug.
Levels are used in the UI to emphasize and deemphasize the crumb. The default is info.
OptionalmessageIf a message is provided, it is rendered as text with all whitespace preserved.
OptionaltimestampThe format is a numeric (integer or float) value representing the number of seconds that have elapsed since the Unixepoch. Breadcrumbs are most useful when they include a timestamp, as it creates a timeline leading up to an event expection/error.
OptionaltypeBy default, all breadcrumbs are recorded as default, which makes them appear as a Debug entry, but Sentry provides other types that influence how the breadcrumbs are rendered. For more information, see the description of recognized breadcrumb types.
Sentry uses breadcrumbs to create a trail of events that happened prior to an issue. These events are very similar to traditional logs but can record more rich structured data.
Link
https://develop.sentry.dev/sdk/event-payloads/breadcrumbs/