6 files declare their use of DiagnosticsException in Purge 8.3

InvalidateCommand.php in modules/purge_drush/src/Commands/InvalidateCommand.php

LateRuntimeProcessor.php in modules/purge_processor_lateruntime/src/EventSubscriber/LateRuntimeProcessor.php

PurgeBlockForm.php in modules/purge_ui/src/Form/PurgeBlockForm.php

PurgersService.php in src/Plugin/Purge/Purger/PurgersService.php

purge_processor_cron.module in modules/purge_processor_cron/purge_processor_cron.module

Purge Cron Processor.

QueueCommands.php in modules/purge_drush/src/Commands/QueueCommands.php