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Tallwatch posts a structured incident card to Slack through an incoming webhook. Setup takes about two minutes and needs admin access to the workspace. Send alerts to a dedicated #incidents or #alerts channel, not a busy general channel where they’ll scroll away.

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1. Create the webhook in Slack

1

Create a Slack app

Go to api.slack.com/apps, click Create New App, then From scratch. Name it something recognizable like Tallwatch alerts and pick the workspace.
2

Enable incoming webhooks

Under Features, open Incoming Webhooks and toggle Activate Incoming Webhooks on.
3

Add the webhook to a channel

Click Add New Webhook to Workspace, choose the channel that should receive alerts, then Allow.
4

Copy the URL

Slack returns a URL like https://hooks.slack.com/services/T0XXXXX/B0XXXXX/AbCdEf.... Copy it.
Treat the webhook URL like a password. Anyone who has it can post to your channel as the app. If it leaks, regenerate it from the same Slack page.

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2. Add the channel in Tallwatch

1

Open the channels page

Go to Settings → Alerts → Channels and click Add channel.
2

Pick Slack

Choose the Slack kind and name it for the audience, like Engineering #incidents.
3

Paste the URL and test

Paste the URL into Incoming webhook URL, click Save, then Send test alert. The message should arrive in Slack within a few seconds.

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3. Route a monitor to it

Open a monitor’s settings, pick an escalation policy that includes this Slack channel, and save. The next incident on that monitor fires to Slack. No policy yet? The channel is picked up automatically by the workspace fallback, which fires every enabled channel for monitors without an explicit policy.

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What the alert looks like

One Slack message per incident event:
  • The monitor name as a bold heading
  • A colored sidebar, red for incident.opened, green for incident.resolved
  • The failing regions
  • The last error from the check
  • A deep link back to the incident in the dashboard
  • An Acknowledge button on a freshly opened incident, so you can pick it up from Slack without opening the dashboard
The in-Slack Acknowledge button needs the Tallwatch Slack app’s signing secret configured on the backend; on a deployment without it, the button is omitted and the rest of the message is unchanged. Resolving still happens in the dashboard.

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Troubleshooting

Most often the channel was deleted or archived after you created the webhook. Slack silently drops messages to dead channels while the URL stays valid. Recreate the webhook against a live channel.Less often, the app was uninstalled. Reinstall it from the same Slack app page.
The webhook URL is malformed or revoked. Regenerate it in the Slack app config and paste the new one into Tallwatch.
Open the channel’s dispatch history. Since every dispatch goes out immediately, a missing message is usually a failed row: Slack returned a non-2xx (deleted channel, revoked webhook), or during a burst its incoming-webhook limit of roughly one message per second rejected the flood. The failed row shows the exact response. If a noisy hour keeps hitting that limit, split those monitors across more than one Slack channel.
Slack channels always send the canonical card, so there’s nothing to configure beyond the URL. If a field is blank, the underlying incident genuinely lacks that value. Want a custom shape? Use a Webhook channel and template the body.

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Reference