This is a write-only style trigger: setting it to true wipes the accumulated counters and results for a single RFC2544/Y.1564 benchmark test instance on the switch's hardware traffic generator. An engineer sets this after reviewing one test run's throughput/frameloss/latency numbers so the next run starts from zero instead of blending old and new samples. For example, after recording a throughput failure at 1518-byte frames, the admin sets cienaCesBenchmarkTestInstanceEntryClearStats to 'true' before re-running the test with a corrected rate-limit profile.