Percona Toolkit was updated to 2.2.6 [bnc#856861]
This is a strongly recommended bugfix release fixing potential data loss.

Highlighted fixes:
* pt-table-sync deletes child table rows
In the worst case, pt-table-sync could delete all rows in child
tables. Now pt-table-sync has option --[no]check-child-tables
which is on by default. In cases were this can be triggered,
pt-table-sync prints a warning and skips the table.
* pt-duplicate-key-checker misses exact duplicate unique indexes
* pt-online-schema-change gets stuck looking for its own _new table
* pt-mysql-summary schema dump prompt can't be disabled
pt-mysql-summary no longer prompts to dump and summarize schemas.
To do this, you must specify --databases or, a new option,
--all-databases. Potentially backwards-incompatible change.
Added options:
* Added pt-query-digest support for Percona Server slow log rate limiting
* Added pt-agent --ping
* Added pt-mysql-summary --all-databases
* Added pt-stalk --sleep-collect
* Added pt-table-sync --[no]check-child-tables
Further changes:
* PTDEBUG prints some info to STDOUT
* pt-agent requires restart after changing MySQL options
* pt-agent --install on PXC is not documented
* pt-agent --install doesn’t check for previous install
* pt-agent --install suggest MySQL user isn’t quoted
* pt-agent --install error about slave is confusing
* pt-agent --uninstall fails if agent is running
* pt-agent docs don’t list privs required for its MySQL user
* pt-deadlock-logger docs use pt-fk-error-logger
* pt-duplicate-key-checker error when EXPLAIN key_len=0
* pt-query-digest stats prints to STDOUT instead of STDERR
* pt-stak error parsing df with NFS
Also contains changes from 2.2.5:
* Query_time histogram has been added to the pt-query-digest JSON
output, not the actual chart but the values necessary to render
the chart later, so the values for each bucket.
* As of pt-table-checksum 2.2.5, skipped chunks cause a non-zero
exit status. An exit status of zero or 32 is equivalent to a zero
exit status with skipped chunks in previous versions of the tool.
* New --no-drop-triggers option has been implemented for
pt-online-schema-change in case users want to rename the tables
manually, when the load is low.
* New --new-table-name option has been added to
pt-online-schema-change which can be used to specify the
temporary table name.
Bugs Fixed in 2.2.5:
* pt-archiver would delete the data even with the --dry-run option.
* pt-query-digest didn’t distill LOAD DATA correctly.
* pt-query-digest didn’t distill INSERT/REPLACE without INTO
correctly.
* pt-agent docs were referencing wrong web address.
* pt-table-checksum --recursion-method=cluster option would crash
if no nodes were found.