@Override
    public void log(Logger logger, Level level, String message, Throwable t) {
        logger.log(level, withLogPrefix(message), t);
    }
@Test
    void verify() {
        context.log(logger, Level.INFO, "A %s message", "log");

        assertEquals(1, logger.records.size());
        assertEquals(Level.INFO, logger.records.get(0).getLevel());
        assertEquals("Cluster 'clustername': A log message", logger.records.get(0).getMessage());
    }