---
sourceDocument: Yokohama IT Operations Management
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/yokohama/it-operations-management

 Release :

    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama IT Operations Management

ft:clusterId :

    - itom

bundleId :

    - itom

workflow :

    - Technology


---

# Horizontal Pattern probe

# Horizontal Pattern probe {#ariaid-title1}

* Release version: Yokohama
* 
* Updated January 30, 2025
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

Discovery uses the Horizontal Pattern probe to launch patterns for horizontal discovery.
The Horizontal Pattern probe works with the Horizontal Discovery sensor to enable Discovery to use patterns for discovery. When you see messages in the ECC Queue from this probe, they appear with the ECC queue name Pattern Launcher, followed by the name of the pattern. The probe contains a sensor named Horizontal Discovery Sensor, which performs the actual updates of the CMDB based on identification rules.

If you create your own device or process classifier and you want to use patterns
for discovery, you must [specify this
probe in the classifier record](https://servicenow-prod.fluidtopics.net/F1AaGd2A7GKs7d9ZAQQp5w#t_AddHorizontalPatternProbe "To use a pattern for the identification and exploration phases of horizontal discovery, you must add the Horizontal Pattern probe to the classifiers for the CIs are you trying to discover."). You do not need to modify this probe or the
Horizontal Discovery sensor.

## Splitting payload

When Discovery uses patterns to find certain devices
like load balancers, large amounts of data could be sent to the ECC Queue. To better handle
large amounts of data, the horizontal pattern probe can split the payload into chunks, and
then create multiple ECC Queue records.
Control how the MID Server splits payloads and handles payloads using properties. See [MID Server properties](https://www.servicenow.com/docs/access?context=r_MIDServerProperties&version=yokohama&pubname=yokohama-servicenow-platform&ft:locale=en-US) for more information.