SERVER-21949, there is a new validation testing hook that we should be running. The following suites should include this new hook:
concurrency concurrency_replication concurrency_sharded jstestfuzz jstestfuzz_replication jstestfuzz_sharded
Note - We can only run the validation testing hook on suites that use a MongoDFixture, ReplicaSetFixture or ShardedClusterFixture. If the suite launches it's own mongod/mongos then the hook cannot be invoked.