> ## Documentation Index
> Fetch the complete documentation index at: https://www.checklyhq.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# SlackAppAlertChannel Construct

> Learn how to configure Slack alert channels with the Checkly CLI.

> [!TIP]
>
> Slack App alert channels require the [Checkly Slack App](https://www.checklyhq.com/docs/integrations/alerts/slack.md) to be installed in your Slack workspace.

Sends alert notifications to Slack channels and as DMs.

```ts Basic Example theme={null}
import { SlackAppAlertChannel } from 'checkly/constructs'

const slackAppChannel = new SlackAppAlertChannel('slack-channel-1', {
  slackChannels: ['#ops', '@John Doe']
})
```

```ts Advanced Example theme={null}
import { SlackAppAlertChannel } from 'checkly/constructs'

const slackAppChannel = new SlackAppAlertChannel('slack-channel-1', {
  slackChannels: ['#ops', '@John Doe'],
  sendRecovery: true,
  sendFailure: true,
  sendDegraded: true,
  sslExpiry: true,
  sslExpiryThreshold: 30,
})
```

> [!NOTE]
>
> If you need to reference existing alert channels that were created outside of your CLI project, use [`fromId()`](https://www.checklyhq.com/docs/constructs/alert-channel#using-fromid-to-reference-an-existing-channel).

## Configuration

### Slack Alert Channel Options

**slackChannels** `string[]` *required*

The Slack channels to alert. Can also include DM handles, e.g. "@John Doe"

```ts highlight={2} theme={null}
new SlackAppAlertChannel('slack-channel-1', {
  slackChannels: ['#ops','@John Doe']
})
```

### General Alert Channel Options

These options are valid for all alert channels types.

**sendRecovery** `boolean`

Whether to send notifications when checks recover from a [failed or degraded state](https://www.checklyhq.com/docs/communicate/alerts/overview.md#alert-channels). Default value is `true`.

**sendFailure** `boolean`

Whether to send notifications when checks [fail](https://www.checklyhq.com/docs/communicate/alerts/overview.md#alert-channels). Default value is `true`.

**sendDegraded** `boolean`

Whether to send notifications when checks [become degraded](https://www.checklyhq.com/docs/communicate/alerts/overview.md#alert-channels). Default value is `false`.

**sslExpiry** `boolean`

Whether to send notifications when a SSL/TLS certificate is about to expire. Default value is `false`.

```ts highlight={3} theme={null}
new EmailAlertChannel("email-channel-1", {
  address: "alerts@acme.com",
  sslExpiry: true,
  sslExpiryThreshold: 30, // Alert 30 days before expiry
})
```

[Learn more about SSL alerts.](https://www.checklyhq.com/docs/communicate/alerts/ssl-expiration.md)

**sslExpiryThreshold** `number`

Number of days before the SSL/TLS certificate expiry date to send notifications. Only relevant when `sslExpiry` is enabled. Default value is `30`.

```ts highlight={4} theme={null}
new EmailAlertChannel("email-channel-1", {
  address: "alerts@acme.com",
  sslExpiry: true,
  sslExpiryThreshold: 30, // Alert 30 days before expiry
})
```

[Learn more about SSL alerts.](https://www.checklyhq.com/docs/communicate/alerts/ssl-expiration.md)


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