You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hosts.go
    path of file: ./repos/jackal/pkg/host
    
    the code of the file until where you have to start completion: // Copyright 2022 The jackal Authors
//
// Licensed 
    
func (hs *Hosts) Certificates() []tls.Certificate {
	hs.mu.RLock()
	defer hs.mu.RUnlock()
	var certs []tls.Certificate
	for _, cer := range hs.hosts {
		certs = append(certs, cer)
	}
	return certs
}