feat(metrics): add blockstats + netstat client wrappers

backend/app/proxmox/client.py

@@ -1309,6 +1309,29 @@ class ProxmoxClient(VmMixin, LxcMixin, ClusterMixin, StorageMixin, NetworkMixin,
                 logger.debug(f"Не удалось получить сетевые интерфейсы VM {vmid} (guest agent может быть не установлен): {e}")
                 return []
 
+        def get_vm_blockstats(self, node: str, vmid: int) -> str:
+            """Raw HMP 'info blockstats' text via the QEMU monitor (VM only).
+            Returns '' if unavailable."""
+            if not self.proxmox:
+                return ""
+            try:
+                res = self.proxmox.nodes(node).qemu(vmid).monitor.post(command="info blockstats")
+                return res if isinstance(res, str) else str(res or "")
+            except Exception as e:
+                logger.debug(f"blockstats unavailable for VM {vmid} on {node}: {e}")
+                return ""
+
+        def get_node_netstat(self, node: str) -> list:
+            """Per-tap/veth interface counters for the node ([] on failure)."""
+            if not self.proxmox:
+                return []
+            try:
+                res = self.proxmox.nodes(node).netstat.get()
+                return res if isinstance(res, list) else []
+            except Exception as e:
+                logger.debug(f"netstat unavailable for node {node}: {e}")
+                return []
+
         def get_container_interfaces(self, node: str, vmid: int) -> List[Dict]:
             """
             Получить сетевые интерфейсы контейнера

backend/tests/test_metrics_client.py

@@ -0,0 +1,37 @@
+from unittest.mock import MagicMock
+from app.proxmox.client import ProxmoxClient
+
+
+def _client_with_mock(proxmox):
+    c = ProxmoxClient.__new__(ProxmoxClient)
+    c.proxmox = proxmox
+    return c
+
+
+def test_get_vm_blockstats_returns_text():
+    px = MagicMock()
+    px.nodes.return_value.qemu.return_value.monitor.post.return_value = "drive-scsi0: rd_operations=5 wr_operations=2"
+    c = _client_with_mock(px)
+    assert "rd_operations=5" in c.get_vm_blockstats("prod", 114)
+    px.nodes.return_value.qemu.return_value.monitor.post.assert_called_once_with(command="info blockstats")
+
+
+def test_get_vm_blockstats_swallows_errors():
+    px = MagicMock()
+    px.nodes.return_value.qemu.return_value.monitor.post.side_effect = RuntimeError("nope")
+    c = _client_with_mock(px)
+    assert c.get_vm_blockstats("prod", 114) == ""
+
+
+def test_get_node_netstat_returns_rows():
+    px = MagicMock()
+    px.nodes.return_value.netstat.get.return_value = [{"dev": "tap114i0", "vmid": "114", "in": "1", "out": "2"}]
+    c = _client_with_mock(px)
+    assert c.get_node_netstat("prod")[0]["dev"] == "tap114i0"
+
+
+def test_get_node_netstat_swallows_errors():
+    px = MagicMock()
+    px.nodes.return_value.netstat.get.side_effect = RuntimeError("nope")
+    c = _client_with_mock(px)
+    assert c.get_node_netstat("prod") == []