For iOS, we commonly see <<slug>> when the log messages contain dashes, which is part of the syntax for our unified events. To have these events displayed separately instead of all grouped under the same <<slug>> event, put spaces instead of dashes with your app. This should remove the slug if all these events get reported using the same bit of your code.
Additionally, if log messages are cut off, we suggest moving the details of the message to log property key-value pairs. You can then also filter for the specific log property keys and values on the main error logging page or on the log details pages. Once added, log properties are also visible under Log Details - App - Log Properties. Log messages are limited to 128 characters. More information can be found here.