This read-only Counter64 tracks the cumulative number of times this specific occurrence type has happened since counters were last reset, per its description, distinct from the count within any single measurement window that triggered an individual log entry. The documented example, 3253 symbol errors resulting in 51 threshold-crossing events, shows this counter tracks the raw underlying occurrence count, which is typically much larger than the number of discrete events it caused. An engineer assessing overall link health over the life of the counter, rather than any one alarm, would read this value to judge cumulative error volume, deciding for example that a fiber run has degraded steadily rather than experienced one isolated bad event.