docs: async def self_check(cls):
          """
          Check that the configuration is correct
  
          - Presence of "token" in the settings
          - Presence of "BERNARD_BASE_URL" in the global configuration
          """
  
          # noinspection PyTypeChecker
          async for check in super(Telegram, cls).self_check():
              yield check
  
          s = cls.settings()
  
          try:
              assert isinstance(s['token'], str)
          except (KeyError, TypeError, AssertionError):
              yield HealthCheckFail(
                  '00005',
                  'Missing "token" for Telegram platform. You can obtain one by'
                  'registering your bot in Telegram.',
              )
  
          if not hasattr(settings, 'BERNARD_BASE_URL'):
              yield HealthCheckFail(
                  '00005',
                  '"BERNARD_BASE_URL" cannot be found in the configuration. The'
                  'Telegram platform needs it because it uses it to '
                  'automatically register its hook.'
              )
  
          if not hasattr(settings, 'WEBVIEW_SECRET_KEY'):
              yield HealthCheckFail(
                  '00005',
                  '"WEBVIEW_SECRET_KEY" cannot be found in the configuration. '
                  'It is required in order to be able to create secure postback '
                  'URLs.'
              )