There are attributes in the Logging Service configuration that affect logging output. The Log Status can be set to Inactive to disable all logging output. The Logging Level can be set to one of the java.util.logging.Level values other than the default INFO to get more or less detailed logging output.
Additionally, an individual log file's logging level can be specified in the Configuration > Servers and Sites > server-name > Advanced page. For a given log file, for exampleamSAML.access, add a property name, iplanet-am-logging.amSAML.access.level with Property Value FINER (or any of the java.util.logging.Levelvalues). The logging level specified here for the log file will take precedence over the Logging Service's Logging Level setting.