Why knapsack_pro hangs / freezes / is stale i.e. for Codeship in Queue Mode?

Some users with larger projects notice that in Queue Mode knapsack_pro Ruby process hangs, for instance for Codeship CI users.

It happens due too big RSpec log output in Queue Mode. To produce less logs on output you can change log level to KNAPSACK_PRO_LOG_LEVEL=warn.

Learn more about log levels.

Please check tip for missing --format argument in RSpec that could lead to freeze of CI node.