* Usage: groovy CheckBadMerge.groovy <commit1> <commit2> ...
 * If any "bad" merge commit is found, it will print the details and exit with non-zero code.
 */
class CheckBadMerge {
    private static final THREAD_POOL = Executors.newCachedThreadPool()

    private static final List<String> MONITORED_FILES = [
        "subprojects/docs/src/docs/release/notes.md",