Alert beacons

Alert beacons are expected to be triggered under undesirable conditions which might impact availability or quality.

Alert beacons are structured as a series of "key=value" pairs separated by delimiter '&'

Values must be url-encoded individually (if necessary) to guard against the delimiter characters '&' and '='

An alert beacon should be sent once every heartbeat interval for as long as the alert condition is true. After the condition recovers, the corresponding alert beacon should not be sent anymore unless the condition reoccurs.