Make sure to add the Scalyr integration and copy the webhook.
Using webhooks with Scalyr
Go to the Alerts page and add a new alert.
webhook-trigger:POST
SPIKE_URL[[{"trigger":#trigger#,"description":#description#,"title":#title#,"link":#link#,"id":#id#}]],
webhook-resolve:POST
SPIKE_URL[[{"trigger":#trigger#,"description":#description#,"title":#title#,"link":#link#,"id":#id#}]]