---
sourceDocument: Brazil IT Operations Management
sourceDocumentLink: https://www.servicenow.com/docs/r/it-operations-management

 Release :

    - brazil

ft:locale :

    - en-US

ft:publication_title :

    - Brazil IT Operations Management

ft:clusterId :

    - itom

bundleId :

    - itom

workflow :

    - Technology


---

# Configure metric rule rate limits

# Configure rate limits for metric rules {#ariaid-title1}

Release version: Brazil  
Updated October 23, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
Control alert volume by setting the maximum number of alerts a single metric or event rule can raise in a
time window, and the total across all rules. Use rate limits to help prevent alert storms and keep processing within your instance capacity.

## Before you begin

Role required: sn_dex.admin

## About this task

The per-rule limit and the total limit are enforced independently. Either limit can stop alert processing first, depending on the values that you set. For details about how the limits interact, see [Metric rule rate limiting](https://www.servicenow.com/docs/0_z1mLPD4JNOVVCrDtBusw "Rate limiting controls how many alerts metric and event rules can raise within a time window. DEX enforces a per-rule limit and a combined limit across all rules, so a single rule matching more devices or events than expected doesn't overwhelm alert processing.").

## Procedure

1. From your ServiceNow instance, navigate to AllAll properties.
2. Select the sn_dex.per_alert_rule_rate_limit property.  
   The System Properties form opens.
3. In the Value field, enter the maximum number of alerts a single rule can raise in one window.  
   The default limit is 300000 every 5 minutes, which is the maximum for the total number of metric rule alerts.
4. Select Update.  
   The new value for the property is saved.
5. **Optional:** Select the sn_dex.alert.rate_limit property to set the combined limit for all metric rules and event rules.

## Result

The new limits take effect in the current 5-minute window.  
Note:  
The value of sn_dex.per_alert_rule_rate_limit for all metric or event rules doesn't exceed the total rate limit defined in sn_dex.per_alert_rule_rate_limit.

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