docs: public CpuAcctMetric snapshot()
    {
      final File cpuacct;
      try {
        cpuacct = new File(
            cgroupDiscoverer.discover(CGROUP).toFile(),
            CGROUP_ACCT_FILE
        );
      }
      catch (RuntimeException re) {
        LOG.error(re, "Unable to fetch snapshot");
        return new CpuAcctMetric(new long[0], new long[0]);
      }
      try {
        return parse(Files.readAllLines(cpuacct.toPath(), StandardCharsets.UTF_8));
      }
      catch (IOException e) {
        throw new RuntimeException(e);
      }
    }