In 2 most recent full commit runs (4.4.24, 4.4.25-rc0) on v4.4 the tasks `benchmarks_orphaned` and `benchmarks_sharding` had never finished and had to be aborted and disabled. It happened because the hosts and distros for `centos6` which they ran on didn't exist anymore.

The hosts and the distros were removed as part of this ticket - BUILD-16958.

There are possible solutions for this:

1. Update the `benchmarks_orphaned` tasks to run on different hosts and distros (please, not `centos7` was also removed as part of the same ticket)
2. Remove `benchmarks_orphaned` which rely on `centos6` distro altogether.