[Metrics UI] Add preview feature for metric threshold alerts (#67684)

Co-authored-by: Elastic Machine <[email protected]>

x-pack/plugins/infra/common/alerting/metrics/index.ts

@@ -0,0 +1,18 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+export * from './types';
+export const INFRA_ALERT_PREVIEW_PATH = '/api/infra/alerting/preview';
+
+export const TOO_MANY_BUCKETS_PREVIEW_EXCEPTION = 'TOO_MANY_BUCKETS_PREVIEW_EXCEPTION';
+export interface TooManyBucketsPreviewExceptionMetadata {
+  TOO_MANY_BUCKETS_PREVIEW_EXCEPTION: any;
+  maxBuckets: number;
+}
+export const isTooManyBucketsPreviewException = (
+  value: any
+): value is TooManyBucketsPreviewExceptionMetadata =>
+  Boolean(value && value.TOO_MANY_BUCKETS_PREVIEW_EXCEPTION);

x-pack/plugins/infra/common/alerting/metrics/types.ts

@@ -0,0 +1,82 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import * as rt from 'io-ts';
+
+// TODO: Have threshold and inventory alerts import these types from this file instead of from their
+// local directories
+export const METRIC_THRESHOLD_ALERT_TYPE_ID = 'metrics.alert.threshold';
+export const METRIC_INVENTORY_THRESHOLD_ALERT_TYPE_ID = 'metrics.alert.inventory.threshold';
+
+export enum Comparator {
+  GT = '>',
+  LT = '<',
+  GT_OR_EQ = '>=',
+  LT_OR_EQ = '<=',
+  BETWEEN = 'between',
+  OUTSIDE_RANGE = 'outside',
+}
+
+export enum Aggregators {
+  COUNT = 'count',
+  AVERAGE = 'avg',
+  SUM = 'sum',
+  MIN = 'min',
+  MAX = 'max',
+  RATE = 'rate',
+  CARDINALITY = 'cardinality',
+  P95 = 'p95',
+  P99 = 'p99',
+}
+
+// Alert Preview API
+const baseAlertRequestParamsRT = rt.intersection([
+  rt.partial({
+    filterQuery: rt.union([rt.string, rt.undefined]),
+    sourceId: rt.string,
+  }),
+  rt.type({
+    lookback: rt.union([rt.literal('h'), rt.literal('d'), rt.literal('w'), rt.literal('M')]),
+    criteria: rt.array(rt.any),
+    alertInterval: rt.string,
+  }),
+]);
+
+const metricThresholdAlertPreviewRequestParamsRT = rt.intersection([
+  baseAlertRequestParamsRT,
+  rt.partial({
+    groupBy: rt.union([rt.string, rt.array(rt.string), rt.undefined]),
+  }),
+  rt.type({
+    alertType: rt.literal(METRIC_THRESHOLD_ALERT_TYPE_ID),
+  }),
+]);
+export type MetricThresholdAlertPreviewRequestParams = rt.TypeOf<
+  typeof metricThresholdAlertPreviewRequestParamsRT
+>;
+
+const inventoryAlertPreviewRequestParamsRT = rt.intersection([
+  baseAlertRequestParamsRT,
+  rt.type({
+    nodeType: rt.string,
+    alertType: rt.literal(METRIC_INVENTORY_THRESHOLD_ALERT_TYPE_ID),
+  }),
+]);
+
+export const alertPreviewRequestParamsRT = rt.union([
+  metricThresholdAlertPreviewRequestParamsRT,
+  inventoryAlertPreviewRequestParamsRT,
+]);
+
+export const alertPreviewSuccessResponsePayloadRT = rt.type({
+  numberOfGroups: rt.number,
+  resultTotals: rt.type({
+    fired: rt.number,
+    noData: rt.number,
+    error: rt.number,
+    tooManyBuckets: rt.number,
+  }),
+});