The status of the monitor. States include:
ACTIVE
ACTIVE_STOPPING, ACTIVE_STOPPED
ACTIVE_STOPPING
ACTIVE_STOPPED
UPDATE_IN_PROGRESS
CREATE_PENDING, CREATE_IN_PROGRESS, CREATE_FAILED
CREATE_PENDING
CREATE_IN_PROGRESS
CREATE_FAILED
DELETE_PENDING, DELETE_IN_PROGRESS, DELETE_FAILED
DELETE_PENDING
DELETE_IN_PROGRESS
DELETE_FAILED