Not everybody uses Slack. And even among those who do, Slack may not be the preferred method to receive GridPane notifications. They may prefer to have them sent to a database or spreadsheet or another team or messaging platform.
Others have asked for support for Microsoft Teams, Discord, and other platforms.
It would be great if notifications could be implemented as a provider mechanism with support for different notification targets.
I'd especially like to see notifications being sent to webhooks.
+1 for webhooks, that would allow us to integrate with w/e we want.