操作系统信息，物理机，Ubuntu18.04，8核16G * 3台
Kubernetes版本信息，例如：v21.5。多节点。
KubeSphere版本信息，例如：v3.2.0。在线安装。2.1.1 升级到3.0.0，在升级到3.1.0 -> 3.2.0。
问题是什么，报错日志是什么，最好有截图。
升级完成后，系统工具里面日志没有采集，经过分析，
kubesphere-logging-system 下的Pod fluent-bit-xxxx 状态正常，但是查看日志，发现一直在报错后重启。
日志图片：
日志详情：
`[2021/11/08 08:29:17] [ info] [input] pausing systemd.1
[2021/11/08 08:29:17] [ info] [input] pausing tail.2
[2021/11/08 08:29:17] [ info] [input] pausing tail.3
[2021/11/08 08:29:17] [error] [lib] backend failed
[2021/11/08 08:29:17] [ info] [input] pausing tail.4
level=error msg=“Fluent bit exited” error=“exit status 255”
level=info msg=backoff delay=5m0s
level=info msg=“backoff timer done” actual=5m0.000154073s expected=5m0s
level=info msg=“Fluent bit started”
Fluent Bit v1.8.3
Copyright © 2019-2021 The Fluent Bit Authors
Copyright © 2015-2018 Treasure Data
Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
https://fluentbit.io
[2021/11/08 08:34:17] [ info] [engine] started (pid=44)
[2021/11/08 08:34:17] [ info] [storage] version=1.1.1, initializing…
[2021/11/08 08:34:17] [ info] [storage] in-memory
[2021/11/08 08:34:17] [ info] [storage] normal synchronization mode, checksum disabled, max_chunks_up=128
[2021/11/08 08:34:17] [ info] [cmetrics] version=0.1.6
[2021/11/08 08:34:17] [ warn] [input:systemd:systemd.0] seek_cursor failed
[2021/11/08 08:34:17] [error] [lib] backend failed
[2021/11/08 08:34:17] [ warn] [input:systemd:systemd.1] seek_cursor failed
[2021/11/08 08:34:17] [error] [filter:parser:parser.0] missing ‘key_name’
[2021/11/08 08:34:17] [error] Failed initialize filter parser.0
[2021/11/08 08:34:17] [ info] [input] pausing systemd.0
[2021/11/08 08:34:17] [ info] [input] pausing systemd.1
[2021/11/08 08:34:17] [ info] [input] pausing tail.2
[2021/11/08 08:34:17] [ info] [input] pausing tail.3
[2021/11/08 08:34:17] [ info] [input] pausing tail.4
level=error msg=“Fluent bit exited” error=“exit status 255”
level=info msg=backoff delay=5m0s
level=info msg=“backoff timer done” actual=5m0.000164248s expected=5m0s
level=info msg=“Fluent bit started”
Fluent Bit v1.8.3
Copyright © 2019-2021 The Fluent Bit Authors
Copyright © 2015-2018 Treasure Data
Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
https://fluentbit.io
[2021/11/08 08:39:17] [ info] [engine] started (pid=47)
[2021/11/08 08:39:17] [ info] [storage] version=1.1.1, initializing…
[2021/11/08 08:39:17] [ info] [storage] in-memory
[2021/11/08 08:39:17] [ info] [storage] normal synchronization mode, checksum disabled, max_chunks_up=128
[2021/11/08 08:39:17] [ info] [cmetrics] version=0.1.6
[2021/11/08 08:39:17] [ warn] [input:systemd:systemd.0] seek_cursor failed
[2021/11/08 08:39:17] [ warn] [input:systemd:systemd.1] seek_cursor failed
[2021/11/08 08:39:17] [error] [filter:parser:parser.0] missing ‘key_name’
[2021/11/08 08:39:17] [error] Failed initialize filter parser.0
[2021/11/08 08:39:17] [ info] [input] pausing systemd.0
[2021/11/08 08:39:17] [ info] [input] pausing systemd.1
[2021/11/08 08:39:17] [ info] [input] pausing tail.2
[2021/11/08 08:39:17] [ info] [input] pausing tail.3
[2021/11/08 08:39:17] [ info] [input] pausing tail.4
[2021/11/08 08:39:17] [error] [lib] backend failed
level=error msg=“Fluent bit exited” error=“exit status 255”
level=info msg=backoff delay=5m0s
level=info msg=“backoff timer done” actual=5m0.000186773s expected=5m0s
level=info msg=“Fluent bit started”
Fluent Bit v1.8.3
Copyright © 2019-2021 The Fluent Bit Authors
Copyright © 2015-2018 Treasure Data
Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
https://fluentbit.io`
烦请协助解决，多谢
