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Offline interval config

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</Expandable>
</ResponseField>
### Offline Checker
The offline checker decides when sites, clients, and remote exit nodes are marked offline. It runs on a fixed interval and marks anything that has not checked in within its threshold as offline, which drives the online/offline status in the dashboard, [alert rules](/manage/alerting/alert-rules) such as `site_offline`, and [multi-site failover](/manage/resources/private/multi-site-routing).
Configure it with the `offline_checker` block and its keys: `check_interval_ms`, `newt_threshold_ms`, `newt_wireguard_threshold_ms`, `olm_threshold_ms`, and `remote_exit_node_threshold_ms`. All values are in milliseconds. Raise a threshold if connectors on unreliable networks flap between online and offline; lower it to detect outages faster.
```yaml title="config.yml"
offline_checker:
check_interval_ms: 30000 # 30 seconds
newt_threshold_ms: 120000 # 2 minutes
newt_wireguard_threshold_ms: 480000 # 8 minutes
olm_threshold_ms: 120000 # 2 minutes
remote_exit_node_threshold_ms: 120000 # 2 minutes
```
<ResponseField name="offline_checker" type="object">
Offline checker interval and thresholds. Omit this block to use the defaults.
<Expandable title="Offline Checker">
<ResponseField name="check_interval_ms" type="integer">
`check_interval_ms`: how often the offline checkers run, in milliseconds. Must be a positive integer.
**Default**: `30000` (30 seconds)
</ResponseField>
<ResponseField name="newt_threshold_ms" type="integer">
`newt_threshold_ms`: how long a Newt site can go without a ping before it is marked offline, in milliseconds.
**Default**: `120000` (2 minutes)
</ResponseField>
<ResponseField name="newt_wireguard_threshold_ms" type="integer">
`newt_wireguard_threshold_ms`: how long a WireGuard site can go without a bandwidth update before it is marked offline, in milliseconds. WireGuard sites do not send pings, so they are judged by their last bandwidth report instead.
**Default**: `480000` (8 minutes)
</ResponseField>
<ResponseField name="olm_threshold_ms" type="integer">
`olm_threshold_ms`: how long an Olm client can go without a ping before it is marked offline, in milliseconds.
**Default**: `120000` (2 minutes)
</ResponseField>
<ResponseField name="remote_exit_node_threshold_ms" type="integer">
`remote_exit_node_threshold_ms`: how long a remote exit node can go without a ping before it is marked offline, in milliseconds.
**Default**: `120000` (2 minutes)
</ResponseField>
</Expandable>
</ResponseField>
## Environment Variables
Some configuration values can be set using environment variables for enhanced security: