Implement Monlet MVP stack and UI updates

server/monlet_server/services/notifiers/alertmanager.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import httpx
+
+from ...redaction import redact
+from .base import DeliveryResult
+from .http import classify_response
+
+
+class AlertmanagerNotifier:
+    name = "alertmanager"
+
+    def __init__(self, client: httpx.AsyncClient, url: str) -> None:
+        self._client = client
+        self._url = url.rstrip("/")
+
+    async def deliver(self, event_type: str, payload: dict) -> DeliveryResult:
+        labels = {
+            "alertname": "monlet_incident",
+            "agent_id": str(payload.get("agent_id", "")),
+            "check_id": str(payload.get("check_id", "")),
+            "incident_key": str(payload.get("incident_key", "")),
+        }
+        annotations = {
+            "severity": str(payload.get("severity", "unknown")),
+            "status": str(payload.get("status", "")),
+            "summary": redact(payload.get("summary") or "") or "",
+        }
+        if payload.get("output"):
+            annotations["output"] = (redact(payload["output"]) or "")[:1024]
+        alert = {
+            "labels": labels,
+            "annotations": annotations,
+            "startsAt": payload.get("opened_at") or payload.get("observed_at"),
+        }
+        if event_type == "resolved" and payload.get("resolved_at"):
+            alert["endsAt"] = payload["resolved_at"]
+        try:
+            resp = await self._client.post(f"{self._url}/api/v2/alerts", json=[alert])
+        except httpx.HTTPError as exc:
+            return DeliveryResult(ok=False, permanent=False, error=type(exc).__name__)
+        ok, perm = classify_response(resp.status_code)
+        if ok:
+            return DeliveryResult(ok=True)
+        return DeliveryResult(ok=False, permanent=perm, error=f"http_{resp.status_code}")