791e89568e
* Change PaloMetrics' name and Catalog's Id generator 1. Remove 'Palo' prefix of class Metric. 2. Add a new CatalogIdGenerator to replace the old AtomicLong, to avoid too many edit logs. 3. Add a new histogram to monitor write letency of edit log write. * modify next id logic * fix a bug that Metric is not init before using HISTO_EDIT_LOG_WRITE_LATENCY * fix a problem