1. A method comprising: determining that a user has specified, via a user interface, a first metric term; generating a list of one or more suggested operators associated with the first metric term, and displaying, via the user interface, the list of suggested operators; determining that the user has selected, via the user interface, one of the suggested operators included in the displayed list of suggested operators; generating a list of one or more suggested metric terms associated with the selected operator, and displaying, via the user interface, the list of suggested metric terms; determining that the user has selected, via the user interface, a second metric term from the suggested metric terms included in list of suggested metric terms; and generating, using one or more processors, a custom metric definition data entity that references information defining a custom metric, the information specifying that metric values associated with the custom metric are generated by processing metric values associated with the first metric term and metric values associated with the second metric term based on the selected operator.