Major - P3 all_config_servers_blackholed_from_mongos.js might fail when setting up a sharded cluster when stopping the balancer with the error:
uncaught exception: Error: error doing query: failed: network error while attempting to run command 'balancerStop' on host '13232d7736b0:20770' : DB.prototype.runCommand@src/mongo/shell/db.js:189:19 DB.prototype.adminCommand@src/mongo/shell/db.js:201:12 sh.stopBalancer@src/mongo/shell/utils_sh.js:184:18 _extendWithShMethods/</self[fn]@src/mongo/shell/shardingtest.js:213:28 _configureCluster@src/mongo/shell/shardingtest.js:226:13 ShardingTest@src/mongo/shell/shardingtest.js:1655:9 @jstests/sharding/all_config_servers_blackholed_from_mongos.js:16:10 @jstests/sharding/all_config_servers_blackholed_from_mongos.js:13:2 failed to load: jstests/sharding/all_config_servers_blackholed_from_mongos.js
In order to debug this, the log level of mongobridge should be increased and wait for the test to fail again to get more information on the failure.