@Benchmark
    public long exponential() {
        return EXPONENTIAL_BACKOFF.nextDelayMillis(numAttemptsSoFar);
    }
Microbenchmarks of an {@link Backoff#exponential(long, long, double) expontational backoff}.
benchmarks/jmh/src/jmh/java/com/linecorp/armeria/core/client/retry/BackoffBenchmark.java