To configure a new webhook in Slack, head to the "Apps" section in the Slack application. Search for "webhook," and click "Incoming WebHooks."
Click "View in App Directory," and in the window that appears click "Add to Slack."
In the "Post to Channel" section, choose the channel you would like to send the messages to, then click "Add Incoming WebHooks Integration."
From the next page, copy the webhook URL.
In the CloudOS portal, browse to Settings > Integrations > Messaging Platforms, and select "Slack." Paste in the webhook URL from the the Slack configuration, and click "Update." Send a test message to test the new webhook.