Amazon is discontinuing Alexa Guard in favor of Emergency Assist, a nearly identical service that was announced at the company's annual hardware event last week. If you paid $6 a month for Alexa Guard, this isn't a big deal, as Emergency Assist costs the same price. But if you're one of the many people who enjoyed the free version of Alexa Guard, your Echo devices will no longer alert you to potential break-ins or house fires.