Horizontal discovery patterns are a series of operations that tell Discovery which CIs to find on your network, what credentials to use, and what tables to populate in the CMDB. Horizontal discovery patterns use variables to store and pass information between the operations. By default, there are two variables that are automatically available for horizontal discovery patterns: infrastructure_system and computer_system. These variables store the information about the infrastructure and the computer system of the target CI, respectively. They are populated by the Horizontal Pattern probe and sensor, which enable Discovery to use patterns for horizontal discovery123.