code: public void setServers(java.util.Collection<Server> servers) {
          if (servers == null) {
              this.servers = null;
              return;
          }
  
          this.servers = new java.util.ArrayList<Server>(servers);
      }
docs: <p>
  Contains the response to a <code>DescribeServers</code> request.
  </p>
  <p>
  <i>For Puppet Server:</i> <code>DescribeServersResponse$Servers$EngineAttributes</code> contains
  PUPPET_API_CA_CERT. This is the PEM-encoded CA certificate that is used by the Puppet API over TCP port number
  8140. The CA certificate is also used to sign node certificates.
  </p>
  
  @param servers
  Contains the response to a <code>DescribeServers</code> request.</p>
  <p>
  <i>For Puppet Server:</i> <code>DescribeServersResponse$Servers$EngineAttributes</code> contains
  PUPPET_API_CA_CERT. This is the PEM-encoded CA certificate that is used by the Puppet API over TCP port
  number 8140. The CA certificate is also used to sign node certificates.