public MetricsTableRequests getMetricsTableRequests() {
    return metricsTableRequests;
  }
The sequence id of the last replayed open region event from the primary region. This is used to
skip entries before this due to the possibility of replay edits coming out of order from
replication.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java