[taskManager plugin status] Do not emit empty status to status Observables

test/analytics/tests/instrumented_events/from_the_server/core_context_providers.ts

@@ -17,7 +17,7 @@ export default function ({ getService }: FtrProviderContext) {
   describe('Core Context Providers', () => {
     let event: Event<Record<string, unknown>>;
     before(async () => {
-      let i = 2;
+      let i = 1;
       do {
         // Wait until we get a GREEN "status_changed" event. At that point all the context providers should be set up.
         const events = await ebtServerHelper.getEvents(i, {

x-pack/plugins/task_manager/server/lib/calculate_health_status.test.ts

@@ -267,7 +267,7 @@ describe('calculateHealthStatus', () => {
         true,
         logger
       )
-    ).toEqual({ status: HealthStatus.Warning, reason: `no health stats available` });
+    ).toEqual({ status: HealthStatus.Uninitialized, reason: `no health stats available` });
   });
 
   test('should return error status if any stat has status error', () => {

x-pack/plugins/task_manager/server/lib/calculate_health_status.ts

@@ -21,7 +21,7 @@ export function calculateHealthStatus(
 
   // if stats are empty, return a warning
   if (isEmpty(summarizedStats.stats)) {
-    return { status: HealthStatus.Warning, reason: `no health stats available` };
+    return { status: HealthStatus.Uninitialized, reason: `no health stats available` };
   }
 
   // if "hot" health stats are any more stale than monitored_stats_required_freshness

x-pack/plugins/task_manager/server/monitoring/monitoring_stats_stream.ts

@@ -55,6 +55,7 @@ export interface MonitoringStats {
 }
 
 export enum HealthStatus {
+  Uninitialized = 'uninitialized',
   OK = 'OK',
   Warning = 'warn',
   Error = 'error',

x-pack/plugins/task_manager/server/routes/health.ts

@@ -14,7 +14,7 @@ import {
 } from '@kbn/core/server';
 import { IClusterClient, DocLinksServiceSetup } from '@kbn/core/server';
 import { Observable, Subject } from 'rxjs';
-import { tap, map } from 'rxjs/operators';
+import { tap, map, filter } from 'rxjs/operators';
 import { throttleTime } from 'rxjs/operators';
 import { UsageCounter } from '@kbn/usage-collection-plugin/server';
 import { Logger, ServiceStatus, ServiceStatusLevels } from '@kbn/core/server';
@@ -114,7 +114,8 @@ export function healthRoute(params: HealthRouteParams): {
       }),
       // Only calculate the summarized stats (calculates all running averages and evaluates state)
       // when needed by throttling down to the requiredHotStatsFreshness
-      map((stats) => withServiceStatus(getHealthStatus(stats)))
+      map((stats) => withServiceStatus(getHealthStatus(stats))),
+      filter(([monitoredHealth]) => monitoredHealth.status !== HealthStatus.Uninitialized)
     )
     .subscribe(([monitoredHealth, serviceStatus]) => {
       serviceStatus$.next(serviceStatus);