ExternalTracker

external_tracker_format: str | None = Field(
    default=None,
    description="External Issue Tracker URL Format. Use the placeholders {user}, {repo} and {index} for the username, repository name and issue index.",
)

external_tracker_regexp_pattern: str | None = Field(
    default=None, description="External Issue Tracker issue regular expression"
)

external_tracker_style: str | None = Field(
    default=None, description="External Issue Tracker Number Format, either `numeric`, `alphanumeric`, or `regexp`"
)

external_tracker_url: str | None = Field(default=None, description='URL of external issue tracker.')