feat: network monitoring from agents (#2266, #1911)

Co-authored-by: Sven van Ginkel <svenvanginkel@icloud.com>
Co-authored-by: xiaomiku01 <xiaomiku01@outlook.com>

internal/site/tests/network-monitor-utils.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, test } from "bun:test"
+import { getMonitorStats } from "../src/lib/network-monitor-utils"
+
+describe("monitor stats derived from stored counts", () => {
+	test("retains probe weights and response precision", () => {
+		const stats = getMonitorStats({
+			monitor: "monitor1",
+			created: 1000,
+			res_min: 5,
+			res_max: 20,
+			total_count: 7,
+			success_count: 6,
+			res_sum: 61,
+		})
+		expect(stats.res_avg).toBeCloseTo(10.1666667)
+		expect(stats.loss).toBeCloseTo(14.2857143)
+		expect(stats.res_min).toBe(5)
+		expect(stats.res_max).toBe(20)
+	})
+
+	test.each([
+		{ total_count: 3, success_count: 0, loss: 100 },
+		{ total_count: 0, success_count: 0, loss: 0 },
+		{ total_count: 1, success_count: 1, loss: 0 },
+	])("handles zero sums with $total_count attempts and $success_count successes", ({ loss, ...counts }) => {
+		const stats = getMonitorStats({
+			monitor: "monitor1",
+			created: 1000,
+			res_min: 0,
+			res_max: 0,
+			res_sum: 0,
+			...counts,
+		})
+		expect(stats).toEqual({ res_avg: 0, res_min: 0, res_max: 0, loss })
+	})
+})