Initial work on uptime for observability homepage API

x-pack/plugins/uptime/kibana.json

@@ -2,7 +2,7 @@
   "configPath": ["xpack", "uptime"],
   "id": "uptime",
   "kibanaVersion": "kibana",
-  "optionalPlugins": ["capabilities", "data", "home"],
+  "optionalPlugins": ["capabilities", "data", "home", "observability"],
   "requiredPlugins": [
     "alerts",
     "embeddable",

x-pack/plugins/uptime/public/apps/plugin.ts

@@ -11,6 +11,7 @@ import {
   PluginInitializerContext,
   AppMountParameters,
 } from 'kibana/public';
+import { UptimeFetchDataResponse } from '../../../observability/public/typings/fetch_data_response';
 import { DEFAULT_APP_CATEGORIES } from '../../../../../src/core/public';
 import { UMFrontendLibs } from '../lib/lib';
 import { PLUGIN } from '../../common/constants';
@@ -27,10 +28,14 @@ import {
 } from '../../../../../src/plugins/data/public';
 import { alertTypeInitializers } from '../lib/alert_types';
 import { kibanaService } from '../state/kibana_service';
+import { fetchIndexStatus } from '../state/api';
+import { ObservabilityPluginSetup } from '../../../observability/public';
+import { fetchUptimeOverviewData } from './uptime_overview_fetcher';
 
 export interface ClientPluginsSetup {
   data: DataPublicPluginSetup;
   home: HomePublicPluginSetup;
+  observability: ObservabilityPluginSetup;
   triggers_actions_ui: TriggersAndActionsUIPublicPluginSetup;
 }
 
@@ -63,6 +68,16 @@ export class UptimePlugin
       });
     }
 
+    // This doesn't actually work
+    plugins.observability.dashboard.register({
+      appName: 'uptime',
+      hasData: async () => {
+        const status = await fetchIndexStatus();
+        return status.docCount > 0;
+      },
+      fetchData: fetchUptimeOverviewData,
+    });
+
     core.application.register({
       appRoute: '/app/uptime#/',
       id: PLUGIN.ID,

x-pack/plugins/uptime/public/apps/uptime_overview_fetcher.ts

@@ -0,0 +1,52 @@
+/*
+ * 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 { fetchPingHistogram, fetchSnapshotCount } from '../state/api';
+import { UptimeFetchDataResponse } from '../../../observability/public/typings/fetch_data_response';
+
+export async function fetchUptimeOverviewData({ startTime, endTime, bucketSize }) {
+  const snapshot = await fetchSnapshotCount({
+    dateRangeStart: startTime,
+    dateRangeEnd: endTime,
+  });
+  const pings = await fetchPingHistogram({ dateStart: startTime, dateEnd: endTime });
+  const response: UptimeFetchDataResponse = {
+    title: 'Uptime',
+    appLink: '/app/uptime#/', // Todo is there some sort of helper that handles subpaths?
+    stats: {
+      monitors: {
+        type: 'number',
+        label: 'Monitors',
+        value: snapshot.total,
+      },
+      up: {
+        type: 'number',
+        label: 'Up',
+        value: snapshot.up,
+      },
+      down: {
+        type: 'number',
+        label: 'Down',
+        value: snapshot.down,
+      },
+    },
+    series: {
+      up: {
+        label: 'Up',
+        coordinates: pings.histogram.map((p) => {
+          return { x: p.x!, y: p.upCount || 0 };
+        }),
+      },
+      down: {
+        label: 'Down',
+        coordinates: pings.histogram.map((p) => {
+          return { x: p.x!, y: p.downCount || 0 };
+        }),
+      },
+    },
+  };
+  return response;
+}