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Receive Autoscaling Notifications in Slack

Judoscale can ping Slack each time we scale your dynos up or down. The Hooks page accepts any webhook URL, so you can keep your team informed without polling the dashboard.

Create a Slack incoming webhook

  1. In Slack, open the App Directory and search for Incoming Webhooks.
  2. Click Add to Slack, pick the channel where you want autoscaling updates, and authorize the app.
  3. Copy the webhook URL Slack generates for that channel.

👀 Note

Some Slack workspaces restrict who can install apps. If you do not see Incoming Webhooks, ask a workspace admin to enable it for your team.

Add the webhook to Judoscale

  1. Sign in to Judoscale and open the app you want to monitor.
  2. Select Hooks in the left navigation.
  3. Choose Add webhook, paste your Slack webhook URL into the Slack notifications field, and save.

Judoscale now posts a message whenever we trigger a scale change. Each update includes the process we scaled and the direction of the change—for example:

Judoscale is scaling UP - scaling to 4 web dynos for your-app-production

✅ Tip

The webhook field isn’t specific to Slack—you can plug in any URL, and we’ll notify it when scaling up and down.

Troubleshooting

  • If Slack does not show a message, reopen the webhook entry on the Hooks page and verify the URL matches the one in Slack.
  • Check your scaling history on the dashboard to confirm Judoscale is actually scaling. Notifications only fire when a scale change occurs.

We’re working on richer notifications, so email us if there are other events or formats that would help your team.