Hi Mark,
thanks for the response.
Just installed Kibana 7.9.0.
The kibana logs on journalctl shortly before and after a kibana service restart look as follows:
Sep 23 09:06:54 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:06:54Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:07:24 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:07:24Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:07:54 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:07:54Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:08:24 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:08:24Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:08:54 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:08:54Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:09:24 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:09:24Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:09:54 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:09:54Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:10:24 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:10:24Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:10:54 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:10:54Z","tags":["error","plugins","taskManager","taskManager"],"pid":31310,"message":"Failed to poll for work: Error: Request Timeout after 30000ms"}
Sep 23 09:10:55 TelevesNM.televes.com systemd[1]: Stopping Kibana...
Sep 23 09:10:55 TelevesNM.televes.com kibana[31310]: {"type":"log","@timestamp":"2020-09-23T07:10:55Z","tags":["info","plugins-system"],"pid":31310,"message":"Stopping all plugins."}
Sep 23 09:11:03 TelevesNM.televes.com systemd[1]: Stopped Kibana.
Sep 23 09:11:35 TelevesNM.televes.com systemd[1]: Started Kibana.
Sep 23 09:11:57 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:11:57Z","tags":["warning","plugins-discovery"],"pid":13345,"message":"Expect plugin "id" in camelCase, but found: beats_management"}
Sep 23 09:11:57 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:11:57Z","tags":["warning","plugins-discovery"],"pid":13345,"message":"Expect plugin "id" in camelCase, but found: triggers_actions_ui"}
Sep 23 09:12:27 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:27Z","tags":["info","plugins-service"],"pid":13345,"message":"Plugin "visTypeXy" is disabled."}
Sep 23 09:12:27 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:27Z","tags":["info","plugins-service"],"pid":13345,"message":"Plugin "auditTrail" is disabled."}
Sep 23 09:12:28 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:28Z","tags":["warning","config","deprecation"],"pid":13345,"message":"Config key [monitoring.cluster_alerts.email_notifications.email_address] will be required for email notifications to work in 8.0.""}
Sep 23 09:12:28 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:28Z","tags":["info","plugins-system"],"pid":13345,"message":"Setting up [92] plugins: [taskManager,licensing,observability,globalSearch,globalSearchProviders,code,usageCollection,ossTelemetry,telemetryCollectionManager,telemetry,telemetryCollectionXpack,kibanaUsageCollection,newsfeed,mapsLegacy,kibanaLegacy,translations,timelion,share,legacyExport,esUiShared,charts,bfetch,expressions,data,home,cloud,console,consoleExtensions,apmOss,searchprofiler,painlessLab,grokdebugger,management,upgradeAssistant,licenseManagement,watcher,indexPatternManagement,advancedSettings,fileUpload,dataEnhanced,savedObjects,visualizations,visualize,visTypeVislib,visTypeVega,visTypeTimeseries,visTypeTimelion,features,security,snapshotRestore,reporting,enterpriseSearch,encryptedSavedObjects,ingestManager,indexManagement,rollup,remoteClusters,crossClusterReplication,indexLifecycleManagement,beats_management,transform,ingestPipelines,maps,graph,canvas,visTypeTagcloud,visTypeTable,visTypeMetric,visTypeMarkdown,tileMap,regionMap,inputControlVis,discover,discoverEnhanced,dashboard,lens,dashboardMode,savedObjectsManagement,spaces,lists,eventLog,actions,case,alerts,alertingBuiltins,ml,securitySolution,infra,monitoring,logstash,apm,uptime]"}
Sep 23 09:12:29 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:29Z","tags":["warning","plugins","security","config"],"pid":13345,"message":"Generating a random key for xpack.security.encryptionKey. To prevent sessions from being invalidated on restart, please set xpack.security.encryptionKey in kibana.yml"}
Sep 23 09:12:29 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:29Z","tags":["warning","plugins","security","config"],"pid":13345,"message":"Session cookies will be transmitted over insecure connections. This is not recommended."}
Sep 23 09:12:29 TelevesNM.televes.com kibana[13345]: {"type":"log","@timestamp":"2020-09-23T07:12:29Z","tags":["warning","plugins","reporting","config"],"pid":13345,"message":"Generating a random key for xpack.reporting.encryptionKey. To prevent sessions from being invalidated on restart, please set xpack.reporting.encryptionKey in kibana.yml"}
