Updates

test/zscore.test.js

@@ -0,0 +1,51 @@
+import test from 'brittle'
+import { MetricStore } from '../server/services/store.js'
+import { AnomalyEngine } from '../server/services/anomaly.js'
+import { stats, zScore, thresholdsFromStats, seriesFromStore } from '../server/services/zscore.js'
+
+test('stats and zScore', (t) => {
+  const s = stats([10, 12, 11, 13, 10])
+  t.ok(s.n === 5)
+  t.ok(Math.abs(s.mean - 11.2) < 0.01)
+  t.ok(s.stdev > 0)
+  t.ok(Math.abs(zScore(11.2, s.mean, s.stdev)) < 0.01)
+  t.ok(zScore(20, s.mean, s.stdev) > 2)
+})
+
+test('thresholdsFromStats greater-than', (t) => {
+  const thr = thresholdsFromStats({ mean: 10, stdev: 2 }, '>', { warnZ: 2, critZ: 3 })
+  t.is(thr.warn, 14)
+  t.is(thr.crit, 16)
+})
+
+test('retrainAnomaly updates thresholds from store', (t) => {
+  const store = new MetricStore()
+  const now = Date.now()
+  for (let i = 0; i < 40; i++) {
+    store.ingest([
+      {
+        chart: 'system.cpu',
+        context: 'system.cpu',
+        ts: now + i * 1000,
+        values: {
+          user: 20 + (i % 3),
+          system: 5,
+          nice: 0,
+          iowait: 0,
+          irq: 0,
+          softirq: 0,
+          idle: 70,
+          steal: 0,
+        },
+      },
+    ])
+  }
+  const eng = new AnomalyEngine({ cpuCount: 2 })
+  const res = eng.retrain(store, { minPoints: 20, warnZ: 2, critZ: 3 })
+  t.ok(res.ok)
+  t.ok(res.updated.length >= 1)
+  const cpu = eng.configs.get('cpu_user_high')
+  t.ok(cpu.warn > 20)
+  t.ok(cpu.crit >= cpu.warn)
+  t.ok(seriesFromStore(store, 'system.cpu', 'user').length >= 20)
+})