Hi, I have EFK stack on Kubernetes in production and everything was working fine until this morning, now Kibana won't open on web and there weren't any errors in the logs. After I restarted Kibana this is in the logs:
[2023-09-06T08:32:00.743+00:00][INFO ][plugins-system.standard] Starting [132] plugins: [translations,monitoringCollection,licensing,globalSearch,globalSearchProviders,features,mapsEms,licenseApiGuard,customBranding,usageCollection,taskManager,cloud,guidedOnboarding,telemetryCollectionManager,telemetryCollectionXpack,kibanaUsageCollection,share,screenshotMode,banners,newsfeed,ftrApis,fieldFormats,expressions,screenshotting,dataViews,charts,esUiShared,customIntegrations,home,searchprofiler,painlessLab,grokdebugger,management,cloudDataMigration,advancedSettings,spaces,security,snapshotRestore,lists,encryptedSavedObjects,telemetry,licenseManagement,files,eventLog,actions,notifications,console,contentManagement,bfetch,data,watcher,fileUpload,ingestPipelines,ecsDataQualityDashboard,alerting,unifiedSearch,unifiedFieldList,savedSearch,savedObjects,graph,savedObjectsTagging,savedObjectsManagement,eventAnnotation,embeddable,reporting,uiActionsEnhanced,presentationUtil,expressionShape,expressionRevealImage,expressionRepeatImage,expressionMetric,expressionImage,controls,dataViewFieldEditor,triggersActionsUi,transform,stackConnectors,stackAlerts,ruleRegistry,visualizations,canvas,visTypeXy,visTypeVislib,visTypeVega,visTypeTimeseries,visTypeTimelion,visTypeTagcloud,visTypeTable,visTypeMetric,visTypeHeatmap,visTypeMarkdown,dashboard,dashboardEnhanced,expressionXY,expressionTagcloud,expressionPartitionVis,visTypePie,expressionMetricVis,expressionLegacyMetricVis,expressionHeatmap,expressionGauge,lens,maps,cases,timelines,sessionView,kubernetesSecurity,threatIntelligence,aiops,discover,observability,fleet,osquery,indexManagement,rollup,remoteClusters,crossClusterReplication,indexLifecycleManagement,cloudSecurityPosture,discoverEnhanced,dataVisualizer,ml,synthetics,securitySolution,infra,upgradeAssistant,monitoring,logstash,enterpriseSearch,apm,visTypeGauge,dataViewManagement]
[2023-09-06T08:32:01.531+00:00][INFO ][plugins.fleet] Task Fleet-Usage-Sender-1.1.0 scheduled with interval 1h
[2023-09-06T08:32:01.557+00:00][INFO ][plugins.monitoring.monitoring] config sourced from: production cluster
[2023-09-06T08:32:03.401+00:00][INFO ][http.server.Kibana] http server running at http://0.0.0.0:5601
[2023-09-06T08:32:03.525+00:00][INFO ][plugins.monitoring.monitoring.kibana-monitoring] Starting monitoring stats collection
[2023-09-06T08:32:03.526+00:00][INFO ][plugins.fleet] Beginning fleet setup
[2023-09-06T08:32:03.535+00:00][INFO ][plugins.fleet] Task Fleet-Usage-Logger-Task scheduled with interval 15m
[2023-09-06T08:32:03.562+00:00][INFO ][status] Kibana is now degraded
[2023-09-06T08:32:04.020+00:00][INFO ][plugins.ruleRegistry] Installed common resources shared between all indices
[2023-09-06T08:32:04.021+00:00][INFO ][plugins.ruleRegistry] Installing resources for index .alerts-observability.uptime.alerts
[2023-09-06T08:32:04.021+00:00][INFO ][plugins.ruleRegistry] Installing resources for index .alerts-security.alerts
[2023-09-06T08:32:04.021+00:00][INFO ][plugins.ruleRegistry] Installing resources for index .preview.alerts-security.alerts
[2023-09-06T08:32:04.022+00:00][INFO ][plugins.ruleRegistry] Installing resources for index .alerts-observability.logs.alerts
[2023-09-06T08:32:04.022+00:00][INFO ][plugins.ruleRegistry] Installing resources for index .alerts-observability.metrics.alerts
[2023-09-06T08:32:04.022+00:00][INFO ][plugins.ruleRegistry] Installing resources for index .alerts-observability.apm.alerts
[2023-09-06T08:32:04.027+00:00][INFO ][plugins.ruleRegistry] Installed resources for index .alerts-observability.metrics.alerts
[2023-09-06T08:32:04.028+00:00][INFO ][plugins.ruleRegistry] Installed resources for index .alerts-observability.apm.alerts
[2023-09-06T08:32:04.029+00:00][INFO ][plugins.ruleRegistry] Installed resources for index .alerts-security.alerts
[2023-09-06T08:32:04.029+00:00][INFO ][plugins.ruleRegistry] Installed resources for index .alerts-observability.uptime.alerts
[2023-09-06T08:32:04.030+00:00][INFO ][plugins.ruleRegistry] Installed resources for index .alerts-observability.logs.alerts
[2023-09-06T08:32:04.032+00:00][INFO ][plugins.ruleRegistry] Installed resources for index .preview.alerts-security.alerts
[2023-09-06T08:32:04.183+00:00][INFO ][plugins.screenshotting.chromium] Browser executable: /usr/share/kibana/x-pack/plugins/screenshotting/chromium/headless_shell-linux_x64/headless_shell
[2023-09-06T08:32:07.037+00:00][INFO ][status] Kibana is now available (was degraded)
[2023-09-06T08:33:09.844+00:00][INFO ][plugins.fleet] Running Fleet Usage telemetry send task
[2023-09-06T08:36:34.582+00:00][ERROR][plugins.fleet] Failed to fetch latest version of synthetics from registry: Error connecting to package registry: request to https://epr.elastic.co/search?package=synthetics&prerelease=true&kibana.version=8.7.0 failed, reason: connect ETIMEDOUT 34.120.127.130:443
[2023-09-06T08:36:34.639+00:00][INFO ][plugins.fleet] Fleet setup completed
[2023-09-06T08:36:34.658+00:00][INFO ][plugins.securitySolution] Dependent plugin setup complete - Starting ManifestTask
[2023-09-06T08:39:51.831+00:00][INFO ][plugins.fleet] Fleet Usage: {"agents_enabled":true,"agents":{"total_enrolled":0,"healthy":0,"unhealthy":0,"offline":0,"inactive":0,"unenrolled":0,"total_all_statuses":0,"updating":0},"fleet_server":{"total_all_statuses":0,"total_enrolled":0,"healthy":0,"unhealthy":0,"offline":0,"updating":0,"num_host_urls":0}}
[2023-09-06T08:40:56.730+00:00][ERROR][plugins.fleet] Failed to fetch latest version of synthetics from registry: Error connecting to package registry: request to https://epr.elastic.co/search?package=synthetics&prerelease=true&kibana.version=8.7.0 failed, reason: connect ETIMEDOUT 34.120.127.130:443
[2023-09-06T08:40:56.734+00:00][INFO ][plugins.synthetics] Installed synthetics index templates
What can be the problem and how can I solve this?