fix: correct operational statistics and form interactions

api/src/infrastructure-monitoring/alert-history.ts

@@ -0,0 +1,68 @@
+import { BadRequestException } from '@nestjs/common';
+import { createHash } from 'node:crypto';
+
+export function alertHistoryRange(from?: string, to?: string, now = new Date()) {
+  const dateKey = (date: Date) => new Date(date.getTime() + 8 * 3600_000).toISOString().slice(0, 10);
+  const endDate = to || dateKey(now);
+  const startDate = from || dateKey(new Date(now.getTime() - 6 * 86400_000));
+  const parse = (value: string) => {
+    const result = new Date(`${value}T00:00:00+08:00`);
+    if (!/^\d{4}-\d{2}-\d{2}$/.test(value) || !Number.isFinite(result.getTime()) || dateKey(result) !== value) {
+      throw new BadRequestException('告警日期无效');
+    }
+    return result.getTime() / 1000;
+  };
+  const start = parse(startDate);
+  const end = parse(endDate) + 86400;
+  if (end <= start || end - start > 31 * 86400) throw new BadRequestException('告警日期范围须为1至31天');
+  return { startDate, endDate, start, end: Math.min(end, now.getTime() / 1000) };
+}
+
+export type AlertHistoryItem = {
+  id: string;
+  name: string;
+  severity: string;
+  service: string;
+  instance: string;
+  startedAt: string;
+  firstObservedAt: string;
+  lastObservedAt: string;
+};
+
+// ALERTS_FOR_STATE stores activeAt as the sample value, separating repeated trigger cycles.
+// Observation boundaries are not claimed as exact recovery times.
+export function mergeAlertHistory(
+  target: Map<string, AlertHistoryItem>,
+  series: Array<{ metric: Record<string, string>; values?: [number, string][] }>,
+  start: number,
+  end: number,
+) {
+  for (const { metric, values } of series) {
+    const labels = Object.entries(metric)
+      .filter(([key]) => key !== '__name__')
+      .sort(([a], [b]) => a.localeCompare(b));
+    const fingerprint = createHash('sha256').update(JSON.stringify(labels)).digest('hex');
+    for (const [time, rawActiveAt] of values ?? []) {
+      const activeAt = Number(rawActiveAt);
+      if (time < start || time >= end || !Number.isFinite(activeAt) || activeAt <= 0 || activeAt > time) continue;
+      const id = `${fingerprint}:${activeAt}`;
+      const observed = new Date(time * 1000).toISOString();
+      const item = target.get(id);
+      if (item) {
+        if (observed < item.firstObservedAt) item.firstObservedAt = observed;
+        if (observed > item.lastObservedAt) item.lastObservedAt = observed;
+      } else {
+        target.set(id, {
+          id,
+          name: metric.alertname || '未命名告警',
+          severity: metric.severity || 'info',
+          service: metric.service || '',
+          instance: metric.instance || '',
+          startedAt: new Date(activeAt * 1000).toISOString(),
+          firstObservedAt: observed,
+          lastObservedAt: observed,
+        });
+      }
+    }
+  }
+}