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For a pattern operation, the <_> placeholder can be replaced by any valid index or wildcard character that can be used to access an element of an array or a table. The $IfTable variable is a table that contains information about the network interfaces of a device1. The InstanceID attribute is a unique identifier for each interface2. To access the InstanceID of a specific interface, the pattern operation can use the following syntax:

$IfTable[].InstanceID

where is either:

• A numeric index that corresponds to the position of the interface in the table, such as 3 for the third interface.
• A dot (.) followed by a key-value pair that matches a specific attribute and value of the interface, such as [.Name=eth0] for the interface with the name eth0.
• An asterisk () that represents a wildcard that matches any interface in the table, such as [] for all interfaces.

References:

• 1: IfTable - Product Documentation: San Diego - ServiceNow
• 2: InstanceID - Product Documentation: San Diego - ServiceNow

The Shazzam Batch Size property determines how many IP addresses are scanned by a single Shazzam probe1. If this value is set to 1000 and a discovery must scan 10,000 IP addresses using a single MID Server, it creates 10 Shazzam probes with each probe scanning 1000 IP addresses. This property can be configured in the Discovery Properties module under Discovery Definition2.

References: 1: Shazzam probe, port probes, and protocols - Now Support 2: [Discovery properties - ServiceNow]

The Duplicate CI Remediator is a feature of ServiceNow Discovery that helps to identify and merge duplicate CIs in the CMDB. It uses predefined rules and criteria to compare CIs across different data sources and determine if they are duplicates. It also provides a user interface to review and approve the suggested merges, or to manually merge CIs as needed. The Duplicate CI Remediator helps to improve the accuracy and quality of the CMDB data and reduce the maintenance efforts.

References:

• Duplicate CI Remediator
• Identify and merge duplicate CIs
• Duplicate CI Remediator rules

Without seeing the specific image, it's challenging to definitively identify the operation. However, based on the options provided, if the image shows an operation that involves interpreting or extracting data from a variable, then "Parse Variable" is the most likely answer. "Parse Variable" is used in ServiceNow Discovery patterns to analyze and extract data from variables collected during the discovery process. References = ServiceNow Discovery documentation, particularly the sections on Discovery Pattern Designer and the various operations that can be used in patterns.