feat(metrics): add query_instance_metrics read aggregation

backend/tests/test_metrics_query.py

@@ -0,0 +1,45 @@
+# backend/tests/test_metrics_query.py
+from datetime import datetime, timezone
+from app.services.metrics_history import query_instance_metrics
+
+
+def _row(db, InstanceMetric, ts, **kw):
+    db.add(InstanceMetric(server_id=1, vmid=114, vm_type="qemu",
+                          ts=datetime.fromtimestamp(ts, tz=timezone.utc), **kw))
+
+
+def test_query_aggregate_all_nic(db_session):
+    from app.models import InstanceMetric
+    _row(db_session, InstanceMetric, 1000, cpu=0.10, mem=100, maxmem=200,
+         disk_used=10, disk_total=40, netin_rate=1.0, netout_rate=2.0,
+         diskread_rate=0.0, diskwrite_rate=0.0, iops_read=5.0, iops_write=1.0)
+    _row(db_session, InstanceMetric, 1005, cpu=0.30, mem=140, maxmem=200,
+         disk_used=20, disk_total=40, netin_rate=3.0, netout_rate=4.0,
+         diskread_rate=0.0, diskwrite_rate=0.0, iops_read=7.0, iops_write=3.0)
+    db_session.commit()
+    out = query_instance_metrics(db_session, 1, 114, from_ts=1000, to_ts=1010, nic="all")
+    assert out["from"] == 1000 and out["to"] == 1010
+    pt = out["data"][0]
+    assert pt["cpu"] == 20.0          # avg(10%,30%)
+    assert pt["netin"] == 2.0         # avg(1,3)
+    assert pt["diskpct"] == 37.5      # avg(25%,50%)
+    assert pt["iops_read"] == 6.0
+
+
+def test_query_specific_nic_overrides_net(db_session):
+    from app.models import InstanceMetric, InstanceNicMetric
+    _row(db_session, InstanceMetric, 1000, cpu=0.0, mem=0, maxmem=1,
+         disk_used=0, disk_total=1, netin_rate=99.0, netout_rate=99.0,
+         diskread_rate=0.0, diskwrite_rate=0.0, iops_read=0.0, iops_write=0.0)
+    db_session.add(InstanceNicMetric(server_id=1, vmid=114,
+        ts=datetime.fromtimestamp(1000, tz=timezone.utc), dev="tap114i0",
+        in_rate=7.0, out_rate=8.0))
+    db_session.commit()
+    out = query_instance_metrics(db_session, 1, 114, 1000, 1010, nic="tap114i0")
+    assert out["meta"]["nics"] == ["tap114i0"]
+    assert out["data"][0]["netin"] == 7.0 and out["data"][0]["netout"] == 8.0
+
+
+def test_query_empty(db_session):
+    out = query_instance_metrics(db_session, 1, 999, 0, 10, nic="all")
+    assert out["data"] == [] and out["meta"]["nics"] == []