add logs

src/core/server/status/status_service.ts

@@ -7,7 +7,15 @@
  */
 
 import { Observable, combineLatest, Subscription } from 'rxjs';
-import { map, distinctUntilChanged, shareReplay, take, debounceTime } from 'rxjs/operators';
+import {
+  map,
+  distinctUntilChanged,
+  shareReplay,
+  take,
+  debounceTime,
+  pairwise,
+  startWith,
+} from 'rxjs/operators';
 import { isDeepStrictEqual } from 'util';
 
 import { CoreService } from '../../types';
@@ -39,6 +47,7 @@ export class StatusService implements CoreService<InternalStatusServiceSetup> {
   private readonly logger: Logger;
   private readonly config$: Observable<StatusConfigType>;
 
+  private overall$?: Observable<ServiceStatus>;
   private pluginsStatus?: PluginsStatusService;
   private overallSubscription?: Subscription;
 
@@ -59,10 +68,7 @@ export class StatusService implements CoreService<InternalStatusServiceSetup> {
     const core$ = this.setupCoreStatus({ elasticsearch, savedObjects });
     this.pluginsStatus = new PluginsStatusService({ core$, pluginDependencies });
 
-    const overall$: Observable<ServiceStatus> = combineLatest([
-      core$,
-      this.pluginsStatus.getAll$(),
-    ]).pipe(
+    this.overall$ = combineLatest([core$, this.pluginsStatus.getAll$()]).pipe(
       // Prevent many emissions at once from dependency status resolution from making this too noisy
       debounceTime(500),
       map(([coreStatus, pluginsStatus]) => {
@@ -78,7 +84,7 @@ export class StatusService implements CoreService<InternalStatusServiceSetup> {
     );
 
     // Create an unused subscription to ensure all underlying lazy observables are started.
-    this.overallSubscription = overall$.subscribe();
+    this.overallSubscription = this.overall$.subscribe();
 
     const router = http.createRouter('');
     registerStatusRoute({
@@ -91,15 +97,15 @@ export class StatusService implements CoreService<InternalStatusServiceSetup> {
       },
       metrics,
       status: {
-        overall$,
+        overall$: this.overall$,
         plugins$: this.pluginsStatus.getAll$(),
         core$,
       },
     });
 
     return {
       core$,
-      overall$,
+      overall$: this.overall$,
       plugins: {
         set: this.pluginsStatus.set.bind(this.pluginsStatus),
         getDependenciesStatus$: this.pluginsStatus.getDependenciesStatus$.bind(this.pluginsStatus),
@@ -109,7 +115,11 @@ export class StatusService implements CoreService<InternalStatusServiceSetup> {
     };
   }
 
-  public start() {}
+  public start() {
+    this.overall$!.pipe(startWith(undefined), pairwise()).subscribe(([oldStatus, newStatus]) => {
+      this.logger.info(`Kibana overall status is now ${newStatus!.level.toString()}`);
+    });
+  }
 
   public stop() {
     if (this.overallSubscription) {

x-pack/plugins/licensing/server/plugin.ts

@@ -6,6 +6,7 @@
  */
 
 import { Observable, Subject, Subscription, timer } from 'rxjs';
+import { take, startWith, map } from 'rxjs/operators';
 import moment from 'moment';
 import { createHash } from 'crypto';
 import stringify from 'json-stable-stringify';
@@ -18,7 +19,8 @@ import {
   Plugin,
   PluginInitializerContext,
   IClusterClient,
-} from 'src/core/server';
+  ServiceStatusLevels,
+} from '../../../../src/core/server';
 
 import { ILicense, PublicLicense, PublicFeatures } from '../common/types';
 import { LicensingPluginSetup, LicensingPluginStart } from './types';
@@ -107,6 +109,26 @@ export class LicensingPlugin implements Plugin<LicensingPluginSetup, LicensingPl
       pollingFrequency.asMilliseconds()
     );
 
+    core.status.set(
+      license$.pipe(
+        startWith(undefined),
+        take(2),
+        map((license) => {
+          if (license) {
+            return {
+              level: ServiceStatusLevels.available,
+              summary: 'License fetched',
+            };
+          } else {
+            return {
+              level: ServiceStatusLevels.degraded,
+              summary: 'license not fetched yet',
+            };
+          }
+        })
+      )
+    );
+
     core.http.registerRouteHandlerContext(
       'licensing',
       createRouteHandlerContext(license$, core.getStartServices)