I have tested the binary tarball, debs and rpms are probably affected too.
Percona-Server-5.6.21-rel69.0-675.Linux.x86_64 $ find . -name query_response_time.test
Percona-Server-5.6.21-rel69.0-675.Linux.x86_64 $
In the source repo they are at plugin/query_response_time/tests/mtr.
This breaks MTR if run out of binary tarball as it expects query_response_time as one of the default suites:
Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test$ ./mysql-test-run 1st --debug-server
Logging: ./mysql-test-run 1st --debug-server
2014-10-29 14:40:18 16083 [Warning] Buffered warning: Changed limits: max_open_files: 1024 (requested 5000)
2014-10-29 14:40:18 16083 [Warning] Buffered warning: Changed limits: table_cache: 431 (requested 2000)
2014-10-29 14:40:18 16083 [Note] Plugin 'FEDERATED' is disabled.
2014-10-29 14:40:18 16083 [Note] Binlog end
2014-10-29 14:40:18 16083 [Note] Shutting down plugin 'CSV'
2014-10-29 14:40:18 16083 [Note] Shutting down plugin 'MyISAM'
MySQL Version 5.6.20
Too long tmpdir path '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/var/tmp' creating a shorter one...
- using tmpdir: '/tmp/KUwSTOuwvt'
Checking supported features...
- SSL connections supported
- binaries are debug compiled
Collecting tests...
** ERROR: Could not find 'query_response_time' or 'mtr' in '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/Release/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/Release/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/Relwithdebinfo/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/Relwithdebinfo/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/Debug/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/share/mysql-test/suite/Debug/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/Release/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/Release/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/Relwithdebinfo/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/Relwithdebinfo/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/Debug/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/suite/Debug/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/Release/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/Release/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/Relwithdebinfo/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/Relwithdebinfo/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/Debug/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/mysql-test/suite/Debug/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/Release/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/Release/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/Relwithdebinfo/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/Relwithdebinfo/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/Debug/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/mysql-test/Debug/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/Release/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/Release/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/Relwithdebinfo/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/Relwithdebinfo/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/Debug/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/plugin/query_response_time/tests/Debug/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/Release/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/Release/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/Relwithdebinfo/query_response_time', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/Relwithdebinfo/mtr', '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/Debug/query_response_time', or '/home/laurynas/percona/lp-mysql-server/percona-server/5.6/bld/Percona-Server-5.6.20-rel68.0-664-debug.Linux.x86_64/internal/plugin/query_response_time/tests/Debug/mtr'
at lib/mtr_cases.pm line 289.
Percona now uses JIRA for bug reports so this bug report is migrated to: https:/