public long getLastResetTime() {
    return lastResetTime;
  }
Return the last reset time in naonseconds since some arbitrary time in the past.
<p>
The time rolls over to zero every 2^64 nanosecs (approx 584 years). Interval computations
spanning periods longer than this will be wrong. If the timer has not yet been reset then the
construction time is returned.

@return timestamp in nanoseconds of construction or the last reset.
geode-core/src/main/java/org/apache/geode/internal/NanoTimer.java