link

    const auto logLevel = TestingProctor::instance().isEnabled() ? 0 : 1;
    LOGV2_DEBUG(21092,
                logLevel,
                "Scheduling fetcher to read remote oplog",
                "syncSource"_attr = source,
                "lastOpTimeFetched"_attr = oplogFetcher->getLastOpTimeFetched_forTest());

This seems like it is trying to only call that function when running in a test, but it actually just raises the loglevel so that it will run in production for anyone who turns on verbose logging. If we want it to run at log level 1, it shouldn't call test-only functions. On the other hand, if we want it to only run in testing, we should use a normal if rather than relying on the shouldLog check in LOGV2_DEBUG.