feat(observability): add Prometheus/Grafana/Loki/Alertmanager/Alloy stack and remove legacy Monitoring UI

frontend/src/hooks/useObservability.ts

@@ -0,0 +1,47 @@
+import { useQuery } from "@tanstack/react-query";
+import {
+	fetchAlertmanagerAlerts,
+	fetchAlertmanagerStatus,
+	fetchPrometheusTargets,
+	fetchMonitoringMachines,
+} from "../api/client";
+
+export function useAlertmanagerAlerts() {
+	return useQuery({
+		queryKey: ["observability", "alerts"],
+		queryFn: fetchAlertmanagerAlerts,
+		retry: 2,
+		staleTime: 10_000,
+		refetchInterval: 15_000,
+	});
+}
+
+export function useAlertmanagerStatus() {
+	return useQuery({
+		queryKey: ["observability", "alertmanager-status"],
+		queryFn: fetchAlertmanagerStatus,
+		retry: 2,
+		staleTime: 10_000,
+		refetchInterval: 30_000,
+	});
+}
+
+export function usePrometheusTargets() {
+	return useQuery({
+		queryKey: ["observability", "prometheus-targets"],
+		queryFn: fetchPrometheusTargets,
+		retry: 2,
+		staleTime: 10_000,
+		refetchInterval: 30_000,
+	});
+}
+
+export function useMonitoringMachines() {
+	return useQuery({
+		queryKey: ["monitoring", "machines"],
+		queryFn: fetchMonitoringMachines,
+		retry: 2,
+		staleTime: 10_000,
+		refetchInterval: 30_000,
+	});
+}