NewPushbullet returns a Pushbullet alerter from the private token available in the `account` page.

NewSlack returns a Slack alerter from the webhookURL.

Attachment Payload for postmessage rest API https://rocket.chat/docs/developer-guides/rest-api/chat/postmessage/.

AttachmentField Payload for postmessage rest API https://rocket.chat/docs/developer-guides/rest-api/chat/postmessage/.

Pushbullet alert container.

Slack alert container.

SlackPostMessage is the main model for sending messages.

Alerter is the interface all alerters should implement.