NoDataError

The NoDataError exception is used to indicate that required data for a policy check is missing. This exception is automatically caught by the Check context manager, which sets the check status to "no-data".

The purpose of NoDataError is to distinguish between:

1. Missing Data: When required data is not present (results in "no-data" status)

2. Failed Assertions: When data is present but doesn't meet the policy requirements (results in "fail" status)

This distinction is important because Lunar re-evaluates policies as data becomes available. A "no-data" status indicates that the policy should be re-evaluated when more data is collected, while a "fail" status indicates a definitive policy violation.

Constructor

NoDataError(message=None)

• message (str, optional): A message describing why the data is missing