old_contents: """
  Experiments module.
  
  By default, only experiments that are listed in the configuration are
  loaded automatically. See configuration variables:
   *_PLUGINS_AUTOLOAD
   *_PLUGINS_EXPERIMENTS
  
  """
  from pprof.settings import CFG
  import logging
  import importlib
  
  def discover():
      if CFG["plugins"]["autoload"].value():
          log = logging.getLogger('pprof')
          experiment_plugins =  CFG["plugins"]["experiments"].value()
          for ep in experiment_plugins:
              log.debug("Found experiment: {0}".format(ep))
              try:
                  importlib.import_module(ep)
              except ImportError:
                  log.error("Could not find '{0}'".format(ep))
  
new_contents: """
  Experiments module.
  
  By default, only experiments that are listed in the configuration are
  loaded automatically. See configuration variables:
   *_PLUGINS_AUTOLOAD
   *_PLUGINS_EXPERIMENTS
  
  """
  from pprof.settings import CFG
  import logging
  import importlib
  
  def discover():
      """
      Import all experiments listed in PLUGINS_EXPERIMENTS.
  
      Tests:
          >>> from pprof.settings import CFG
          >>> from pprof.experiments import discover
          >>> import logging as lg
          >>> import sys
          >>> l = lg.getLogger('pprof')
          >>> lg.getLogger('pprof').setLevel(lg.DEBUG)
          >>> lg.getLogger('pprof').handlers = [lg.StreamHandler(stream=sys.stdout)]
          >>> CFG["plugins"]["experiments"] = ["pprof.non.existing", "pprof.experiments.raw"]
          >>> discover()
          Could not find 'pprof.non.existing'
          Found experiment: pprof.experiments.raw
      """
      if CFG["plugins"]["autoload"].value():
          log = logging.getLogger('pprof')
          experiment_plugins = CFG["plugins"]["experiments"].value()
          for ep in experiment_plugins:
              try:
                  importlib.import_module(ep)
                  log.debug("Found experiment: {0}".format(ep))
              except ImportError:
                  log.error("Could not find '{0}'".format(ep))
  
subject: add doctets for experiment discovery