code: func (registry *Registry) CheckStatus() map[string]string { // TODO(stevvooe) this needs a proper type
  	registry.mu.RLock()
  	defer registry.mu.RUnlock()
  	statusKeys := make(map[string]string)
  	for k, v := range registry.registeredChecks {
  		err := v.Check()
  		if err != nil {
  			statusKeys[k] = err.Error()
  		}
  	}
  
  	return statusKeys
  }
docs: // CheckStatus returns a map with all the current health check errors