code: func (m *Meta) providerPluginAutoInstalledSet() discovery.PluginMetaSet {
  	plugins := discovery.FindPlugins("provider", []string{m.pluginDir()})
  	plugins, _ = plugins.ValidateVersions()
  
  	for p := range plugins {
  		log.Printf("[DEBUG] found valid plugin: %q", p.Name)
  	}
  
  	return plugins
  }
docs: // providerPluginAutoInstalledSet returns the set of providers that exist
  // within the auto-install directory.