Yesterday I had a credo failure on a merged PR. The same code had made it through two passes of our CI server (once on the branch and once on merge).
Inspecting the logs revealed that Credo had timed out parsing a file and just gave up leaving an innoculous info message.
Looking at the docs https://hexdocs.pm/credo/config_file.html reveals a config value that can be used to raise the timeout value. parse_timeout defaults to 5000 but can be given a larger value.
Developer Rants 