docs: def update_local(self):
          """Update CPU stats using psutil."""
          # Grab CPU stats using psutil's cpu_percent and cpu_times_percent
          # Get all possible values for CPU stats: user, system, idle,
          # nice (UNIX), iowait (Linux), irq (Linux, FreeBSD), steal (Linux 2.6.11+)
          # The following stats are returned by the API but not displayed in the UI:
          # softirq (Linux), guest (Linux 2.6.24+), guest_nice (Linux 3.2.0+)
  
          # Init new stats
          stats = self.get_init_value()
  
          stats['total'] = cpu_percent.get()
          cpu_times_percent = psutil.cpu_times_percent(interval=0.0)
          for stat in ['user', 'system', 'idle', 'nice', 'iowait',
                       'irq', 'softirq', 'steal', 'guest', 'guest_nice']:
              if hasattr(cpu_times_percent, stat):
                  stats[stat] = getattr(cpu_times_percent, stat)
  
          # Additional CPU stats (number of events not as a %; psutil>=4.1.0)
          # ctx_switches: number of context switches (voluntary + involuntary) per second
          # interrupts: number of interrupts per second
          # soft_interrupts: number of software interrupts per second. Always set to 0 on Windows and SunOS.
          # syscalls: number of system calls since boot. Always set to 0 on Linux.
          cpu_stats = psutil.cpu_stats()
          # By storing time data we enable Rx/s and Tx/s calculations in the
          # XML/RPC API, which would otherwise be overly difficult work
          # for users of the API
          time_since_update = getTimeSinceLastUpdate('cpu')
  
          # Previous CPU stats are stored in the cpu_stats_old variable
          if not hasattr(self, 'cpu_stats_old'):
              # First call, we init the cpu_stats_old var
              self.cpu_stats_old = cpu_stats
          else:
              for stat in cpu_stats._fields:
                  if getattr(cpu_stats, stat) is not None:
                      stats[stat] = getattr(cpu_stats, stat) - getattr(self.cpu_stats_old, stat)
  
              stats['time_since_update'] = time_since_update
  
              # Core number is needed to compute the CTX switch limit
              stats['cpucore'] = self.nb_log_core
  
              # Save stats to compute next step
              self.cpu_stats_old = cpu_stats
  
          return stats