Warnings after patching from 7.4.0 to 7.4.1

Just patched kibana as the last component after patching hole cluster from 7.4.0 to 7.4.1 and find these kibana warnings when launched:

{"type":"log","@timestamp":"2019-10-26T07:31:24Z","tags":["warning","plugins","security","config"],"pid":19245,"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"}
{"type":"log","@timestamp":"2019-10-26T07:31:45Z","tags":["plugin","warning"],"pid":19245,"path":"/opt/kibana/src/legacy/core_plugins/markdown_vis","message":"Skipping non-plugin directory at /opt/kibana/src/legacy/core_plugins/markdown_vis"}
{"type":"log","@timestamp":"2019-10-26T07:31:45Z","tags":["plugin","warning"],"pid":19245,"path":"/opt/kibana/src/legacy/core_plugins/metric_vis","message":"Skipping non-plugin directory at /opt/kibana/src/legacy/core_plugins/metric_vis"}
{"type":"log","@timestamp":"2019-10-26T07:31:45Z","tags":["plugin","warning"],"pid":19245,"path":"/opt/kibana/src/legacy/core_plugins/table_vis","message":"Skipping non-plugin directory at /opt/kibana/src/legacy/core_plugins/table_vis"}
{"type":"log","@timestamp":"2019-10-26T07:31:45Z","tags":["plugin","warning"],"pid":19245,"path":"/opt/kibana/src/legacy/core_plugins/tagcloud","message":"Skipping non-plugin directory at /opt/kibana/src/legacy/core_plugins/tagcloud"}
{"type":"log","@timestamp":"2019-10-26T07:31:45Z","tags":["plugin","warning"],"pid":19245,"path":"/opt/kibana/src/legacy/core_plugins/vega","message":"Skipping non-plugin directory at /opt/kibana/src/legacy/core_plugins/vega"}
{"type":"log","@timestamp":"2019-10-26T07:31:47Z","tags":["warning","encrypted_saved_objects"],"pid":19245,"message":"Generating a random key for xpack.encrypted_saved_objects.encryptionKey. To be able to decrypt encrypted saved objects attributes after restart, please set xpack.encrypted_saved_objects.encryptionKey in kibana.yml"}
{"type":"log","@timestamp":"2019-10-26T07:31:47Z","tags":["reporting","browser-driver","warning"],"pid":19245,"message":"Enabling the Chromium sandbox provides an additional layer of protection."}
{"type":"log","@timestamp":"2019-10-26T07:31:48Z","tags":["warning"],"pid":19245,"kibanaVersion":"7.4.1","nodes":[{"version":"7.4.0","http":{"publish_address":"grafana.nms.mail.dk/62.243.41.180:9200"},"ip":"62.243.41.180"}],"message":"You're running Kibana 7.4.1 with some different versions of Elasticsearch. Update Kibana or Elasticsearch to the same version to prevent compatibility issues: v7.4.0 @ grafana.nms.mail.dk/62.243.41.180:9200 (62.243.41.180)"}
{"type":"log","@timestamp":"2019-10-26T07:31:49Z","tags":["reporting","warning"],"pid":19245,"message":"Generating a random key for xpack.reporting.encryptionKey. To prevent pending reports from failing on restart, please set xpack.reporting.encryptionKey in kibana.yml"}
{"type":"log","@timestamp":"2019-10-26T07:31:49Z","tags":["reporting","warning"],"pid":19245,"message":"The Reporting plugin encountered issues launching Chromium in a self-test. You may have trouble generating reports: [Error: Failed to launch chrome!\n/var/lib/kibana/headless_shell-linux/headless_shell: /lib64/libc.so.6: version GLIBC_2.14' not found (required by /var/lib/kibana/headless_shell-linux/headless_shell)\n/var/lib/kibana/headless_shell-linux/headless_shell: /lib64/libc.so.6: versionGLIBC_2.15' not found (required by /var/lib/kibana/headless_shell-linux/headless_shell)\n/var/lib/kibana/headless_shell-linux/headless_shell: /lib64/libc.so.6: version `GLIBC_2.16' not found (required by /var/lib/kibana/headless_shell-linux/headless_shell)\n\n\nTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md\n]"}
{"type":"log","@timestamp":"2019-10-26T07:31:49Z","tags":["reporting","warning"],"pid":19245,"message":"See Chromium's log output at "/var/lib/kibana/headless_shell-linux/chrome_debug.log""}
{"type":"log","@timestamp":"2019-10-26T07:31:49Z","tags":["reporting","warning"],"pid":19245,"message":"Reporting plugin self-check failed. Please check the Kibana Reporting settings. Error: Could not close browser client handle!"}
{"type":"log","@timestamp":"2019-10-26T07:31:49Z","tags":["warning","telemetry"],"pid":19245,"message":"Error scheduling task, received [task:oss_telemetry-vis_telemetry]: version conflict, document already exists (current version [17]): [version_conflict_engine_exception] [task:oss_telemetry-vis_telemetry]: version conflict, document already exists (current version [17]), with { index_uuid="CorSIlscTN6pEFXWYLTAlg" & shard="0" & index=".kibana_task_manager_2" }"}
{"type":"log","@timestamp":"2019-10-26T07:31:49Z","tags":["warning","maps"],"pid":19245,"message":"Error scheduling telemetry task, received [task:Maps-maps_telemetry]: version conflict, document already exists (current version [17]): [version_conflict_engine_exception] [task:Maps-maps_telemetry]: version conflict, document already exists (current version [17]), with { index_uuid="CorSIlscTN6pEFXWYLTAlg" & shard="0" & index=".kibana_task_manager_2" }"}

Wondering how to resolve the telemetry version conflict and if it's an issue going forward (patching in future)?

Wouldn't kibana 7 be compiled to be able to run under an updated centOS 6 anymore?

[root@kibana]# ldd /var/lib/kibana/headless_shell-linux/headless_shell
/var/lib/kibana/headless_shell-linux/headless_shell: /lib64/libc.so.6: version 'GLIBC_2.14' not found (required by /var/lib/kibana/headless_shell-linux/headless_shell)
/var/lib/kibana/headless_shell-linux/headless_shell: /lib64/libc.so.6: version 'GLIBC_2.15' not found (required by /var/lib/kibana/headless_shell-linux/headless_shell)
/var/lib/kibana/headless_shell-linux/headless_shell: /lib64/libc.so.6: version 'GLIBC_2.16' not found (required by /var/lib/kibana/headless_shell-linux/headless_shell)
...
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fb3d232a000)
libc.so.6 => /lib64/libc.so.6 (0x00007fb3d1f96000)

[root@kibana]# nm /lib64/libc.so.6 | awk '$2=="A"{print}'
0000000000000000 A GLIBC_2.10
0000000000000000 A GLIBC_2.11
0000000000000000 A GLIBC_2.12
0000000000000000 A GLIBC_2.2.5
0000000000000000 A GLIBC_2.2.6
0000000000000000 A GLIBC_2.3
0000000000000000 A GLIBC_2.3.2
0000000000000000 A GLIBC_2.3.3
0000000000000000 A GLIBC_2.3.4
0000000000000000 A GLIBC_2.4
0000000000000000 A GLIBC_2.5
0000000000000000 A GLIBC_2.6
0000000000000000 A GLIBC_2.7
0000000000000000 A GLIBC_2.8
0000000000000000 A GLIBC_2.9
0000000000000000 A GLIBC_PRIVATE
[root@kibana]# cat /etc/centos-release
CentOS release 6.10 (Final)

TIA

The warnings should be fine, most of them will fix themselves, like the telemetry one. As for the glibc error, that was due to the experimental Code app, which was removed in 7.5 so there won't be any more problems with centos6.

@Marius_Dragomir Okay, thanks, rgd glib is 7.5 headless going work on CentOS/RHEL 6 (glibc 2.12)?

i think it depends on the chromium version. We did update it recently, so maybe it will work in more recent versions of the stack.

Believe it's easier to upgrade the OS to CentOS7/8...

If that is something that you can do, I' wholeheartedly suggest it. We are trying to phase down support for older versions of OSs (mainly for more security features), but it takes some time.