Acting on a codometer failure

A --check run reports three different kinds of finding, and they call for three different responses. Reading which one occurred, rather than reacting to "the check failed," is most of this skill.

A breach

A metric went past a limit declared for it. The report names the metric, the limit's value, and its severity:

• warn prints the breach and leaves the exit code alone. Nothing about the run fails; it is advance notice that a number is moving in a direction worth watching.
• fail exits 1, and only when the run asked --check limits for a gate at all — a bare codometer measuring the same breach reports nothing wrong, because nothing asked it to gate.