private static String qualifyMetrics(String prefix, TableName tableName) {
    StringBuilder sb = new StringBuilder();
    sb.append(prefix).append("_");
    sb.append("Namespace_").append(tableName.getNamespaceAsString());
    sb.append("_table_").append(tableName.getQualifierAsString());
    return sb.toString();
  }
The name of the metrics context that metrics will be under in jmx
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/metrics/MetricsTableRequests.java