A user interface for an event monitor that monitors a data stream receives
an event message having at least one level of categorization, adds the
event message to a log file, produces an alert status corresponding to a
value of a component of the at least one level of categorization, selects
the component of the at least one level of categorization, creates a
filter according to filter criteria corresponding to the selected
component of the at least one level of categorization, filters the log
file to produce a filtered log file, and outputs the filtered log file
containing event messages corresponding to the selected component of the
at least one level of categorization.