You can add the following trigger using cmsh on your active head node:
# cmsh % monitoring trigger % add node_down % expression % set measurables devicestatus % set value down % set operator == % .. % .. % set enteractions send\ e-mail\ to\ administrators % commit
Now all contacts listed in the Administrator E-mail property in Bright will receive an email whenever a node enters the DOWN status.
Conversely, to have those same people receive an email whenever a node goes back UP:
# cmsh % monitoring trigger % add node_up % expression % set measurables devicestatus % set value up % set operator == % .. % .. % set enteractions send\ e-mail\ to\ administrators% set markentityasfailed no% commit