pt-mysql-summary failed to report some key percona features

[Olivier Doucet]

Using pt-mysql-summary 2.1.6

Reports following :
# Key Percona Server features ################################
      Table & Index Stats | Not Supported
     Import InnoDB Tables | Not Supported
     Fast Server Restarts | Not Supported
      Response Time Hist. | Not Supported
          Smooth Flushing | Not Supported

Source code :
   name_val "Table & Index Stats" \
            "$(feat_on "$file" userstat_running)"

But variable name has changed :
http://www.percona.com/doc/percona-server/5.5/diagnostics/user_stats.html?id=percona-server:features:userstatv2
5.5.10-20.1:
Renamed variable userstat_running to userstat.

Tool should check for both variable names ('userstat_running' and 'userstat')

Same report applies for :
"Import InnoDB Tables"
5.5.10-20.1: Renamed variable innodb_expand_import to innodb_import_table_from_xtrabackup.

"Fast Server Restarts"
This variable was renamed to innodb_buffer_pool_restore_at_startup, beginning in release 5.5.10-20.1. It still exists as innodb_auto_lru_dump in versions prior to that.

"Response Time Hist."
query_response_time_stats / enable_query_response_time_stats

"Smooth flushing"
innodb_adaptive_checkpoint / innodb_adaptive_flushing_method