private void addOptionalDeltaLogger(String name, Supplier<Optional<Duration>> supplier,
    DoubleFunction<String> format) {
    addDeltaLogger(name, () -> supplier.get().orElse(Duration.ZERO), format);
  }
Adds the average number of CPUs and % time in GC since last log along with memory usage, total memory, and memory
used after last GC to the output.
planetiler-core/src/main/java/com/onthegomap/planetiler/stats/ProgressLoggers.java