ck-ops/code/grafana/public/app/features/variables/constants.ts

export const NEW_VARIABLE_ID = '00000000-0000-0000-0000-000000000000';
export const ALL_VARIABLE_TEXT = 'All';
export const ALL_VARIABLE_VALUE = '$__all';
export const NONE_VARIABLE_TEXT = 'None';
export const NONE_VARIABLE_VALUE = '';