code: func (c *Cache) GetCertAuthority(id services.CertAuthID, loadSigningKeys bool, opts ...services.MarshalOption) (services.CertAuthority, error) {
  	return c.trustCache.GetCertAuthority(id, loadSigningKeys, services.AddOptions(opts, services.SkipValidation())...)
  }
docs: // GetCertAuthority returns certificate authority by given id. Parameter loadSigningKeys
  // controls if signing keys are loaded