tag_exists(name: const string) -> bool

Return true if the input has a correlation tag with the given name.

Domain

This is a scalar function (calculates a single output value for a single input row).

Categories

• Boolean

Examples

filter if(tag_exists("service.name"), not is_null(#"service.name"), true)

Keeps rows where service.name is set. When the input has no service.name tag, the filter keeps every row.