I don't think removing the files is a good idea. There is SAS code that manages the content and lets you prune the data.
The exact path might vary depending on where SAS is installed, the following code...
[Path to SAS installation]\SASEnvironment\SASCode\Jobs\apm_archive_data.sas
In the top of that code there is a path, %let sasUsageDir=<path>; that points to where APM data is stored. The code provides a template for archiving/deleting data over a specified age from the artifacts directory to the archive directory in \APM\Data\. You could set the archive directory to another location. By default all of the files wind up in \APM\Data\ so that directory can grow quite large.
Does this help? Do you see the code in your SASHome?