Revert "Refactor datastores to classes (#9179)" (#11273)

This reverts commit e5dad7a64e.

includes/html/api_functions.inc.php

@@ -21,7 +21,6 @@ use Illuminate\Routing\Router;
 use Illuminate\Support\Facades\Validator;
 use LibreNMS\Alerting\QueryBuilderParser;
 use LibreNMS\Config;
-use LibreNMS\Data\Store\Datastore;
 use LibreNMS\Exceptions\InvalidIpException;
 use LibreNMS\Util\IPv4;
 
@@ -84,8 +83,9 @@ function api_get_graph(array $vars)
 
     ob_start();
 
+    rrdtool_initialize(false);
     include 'includes/html/graphs/graph.inc.php';
-    Datastore::terminate();
+    rrdtool_close();
 
     $image = ob_get_contents();
     ob_end_clean();

includes/html/graphs/application/proxmox_traffic.inc.php

@@ -18,7 +18,7 @@
 
 require 'includes/html/graphs/common.inc.php';
 
-$proxmox_rrd = Rrd::proxmoxName($vars['cluster'], $vars['vmid'], $vars['port']);
+$proxmox_rrd = proxmox_rrd_name($vars['cluster'], $vars['vmid'], $vars['port']);
 
 if (rrdtool_check_rrd_exists($proxmox_rrd)) {
     $rrd_filename = $proxmox_rrd;