This read-write DisplayString, up to 64 characters, is the symbolic name associated with a running BERT test stream, mirroring the name assigned in the corresponding config stream per its description. An administrator uses this to identify which active test instance a set of live monitoring results (like sync state and error counts) belongs to when multiple BERT tests are running concurrently. For example, an operator watching several simultaneous BERT sessions would rely on distinct bertTestStreamName values to tell which live results belong to the customer-A test versus the customer-B test.