docs: def bash_echo_metric():
      """A very basic example that monitors
      a number of currently running processes"""
      import subprocess
      # import random
  
      # more predictable version of the metric
      cmd = (
          'set -o pipefail '
          ' ; pgrep -f "^bash.*sleep .*from bash: started relay launcher"'
          ' | wc -l '
      )
  
      # less predictable version of the metric
      # cmd = 'ps aux|wc -l'
  
      while True:
          yield (
              int(subprocess.check_output(cmd, shell=True, executable='bash'))
              # + random.choice([-2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8])
          )