added api

backend/app/homelab/monitoring.py

@@ -0,0 +1,70 @@
+import hashlib
+import json
+import time
+from typing import Any
+
+from sqlalchemy.orm import Session
+
+from app.config import get_settings
+from app.homelab.netdata import NetdataClient
+from app.homelab.state import get_state, set_state
+
+ALERT_COOLDOWN_SEC = 1800
+
+
+def _alarm_key(alarm: dict[str, Any]) -> str:
+    return f"{alarm.get('name')}:{alarm.get('status')}"
+
+
+def check_netdata_alerts(db: Session) -> list[str]:
+    settings = get_settings()
+    if not settings.netdata_alerts_enabled:
+        return []
+
+    result = NetdataClient().fetch_alarms()
+    if not result.get("ok"):
+        return []
+
+    alarms = result.get("alarms") or []
+    significant = [
+        a for a in alarms
+        if (a.get("status") or "").lower() in ("warning", "critical", "raised")
+    ]
+    if not significant:
+        return []
+
+    prev_raw = get_state(db, "netdata_alarm_hashes") or "{}"
+    try:
+        prev_map: dict[str, float] = json.loads(prev_raw)
+    except json.JSONDecodeError:
+        prev_map = {}
+
+    now = time.time()
+    notices: list[str] = []
+    new_map = dict(prev_map)
+
+    for alarm in significant:
+        key = _alarm_key(alarm)
+        digest = hashlib.sha256(json.dumps(alarm, sort_keys=True).encode()).hexdigest()[:16]
+        state_key = f"netdata:{key}:{digest}"
+        last_sent = prev_map.get(state_key, 0)
+        if now - last_sent < ALERT_COOLDOWN_SEC:
+            continue
+
+        host = alarm.get("host") or "server"
+        value = alarm.get("value_string") or ""
+        info = alarm.get("info") or alarm.get("name") or "алерт"
+        status = alarm.get("status") or "alert"
+        link = settings.netdata_public_url
+        link_part = f" [Netdata]({link})" if link else ""
+        notices.append(
+            f"⚠️ **Netdata** · {host}: {info} — {status}"
+            + (f" ({value})" if value else "")
+            + link_part
+        )
+        new_map[state_key] = now
+
+    if notices:
+        set_state(db, "netdata_alarm_hashes", json.dumps(new_map))
+
+    return notices