var event common.UserSignedUp
        err := json.Unmarshal(msg.Payload, &event)
        if err != nil {
            return err
        }

        fmt.Println("Adding user", event.UserID, "to the CRM")

        return nil
    },
)`,
                }],
            },
            {
                number: 3,
                topic: "UserSignedUp-3",
                title: "Two replicas of the newsletter service",
                description: `
<p>We scale the newsletter service horizontally, adding an identic