Add autoscaling outcomes to Metrics (Refs #140)

tests/unit/metrics-refresh.test.ts

@@ -17,6 +17,15 @@ const report = (days: number) => ({
     summary: totals,
     running: { average: null, peak: 0, capturedHours: 0 },
     matches: emptyMatches,
+    autoscaling: {
+        added: 0,
+        removed: 0,
+        failed: 0,
+        cancelled: 0,
+        readinessSamples: 0,
+        readinessMeanSeconds: null,
+        readinessMaxSeconds: null
+    },
     points: [],
     maps: [],
     sampledServerCount: 0,
@@ -71,6 +80,26 @@ function setup(fetcher: typeof fetch) {
 }
 
 describe('metrics background refresh', () => {
+    it.each([
+        null,
+        { ...report(7).autoscaling, added: -1 },
+        { ...report(7).autoscaling, cancelled: 1.5 },
+        { ...report(7).autoscaling, readinessMeanSeconds: '72' },
+        { ...report(7).autoscaling, readinessMaxSeconds: -1 }
+    ])(
+        'keeps the previous report when autoscaling measurements are invalid (%j)',
+        async (autoscaling) => {
+            const refresh = setup(
+                vi.fn().mockResolvedValue(Response.json({ ...report(7), autoscaling }))
+            );
+            await refresh.refresh();
+            expect(refresh.onData).not.toHaveBeenCalled();
+            expect(refresh.onError).toHaveBeenLastCalledWith(
+                'The metrics response was incomplete.'
+            );
+        }
+    );
+
     it.each([undefined, null, -1, 1.5, '1'])(
         'rejects an invalid sampled-server count (%s) and accepts a count without server rows',
         async (sampledServerCount) => {