Fluentbit drops logs when huge load of logs incoming

[smiley-ci]

Bug Report

fluent-bit.conf: |
[SERVICE]
Flush 120
Log_Level Trace
Daemon off
Parsers_File parsers.conf
HTTP_Server ${HTTP_SERVER}
HTTP_Listen 0.0.0.0
HTTP_Port ${HTTP_PORT}
storage.path /var/fluent-bit/state/flb-storage/
storage.sync normal
storage.checksum off
storage.backlog.mem_limit 50M
[INPUT]
Name tail
Tag kubernetes.logs.*
Path /var/log/containers/.log
Docker_Mode On
Docker_Mode_Flush 5
Docker_Mode_Parser container_firstline
Parser docker
DB /var/fluent-bit/state/flb_container.db
Skip_Long_Lines On
Refresh_Interval 5
Rotate_Wait 30
storage.type filesystem
Read_from_Head false
Threaded true
[FILTER]
Name kubernetes
Match kubernetes.logs.
tls.verify Off
Kube_URL https://kubernetes.default.svc.cluster.local:443
Kube_CA_File /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
Kube_Token_File /var/run/secrets/kubernetes.io/serviceaccount/token
Kube_Tag_Prefix kubernetes.logs.var.log.containers
Merge_Log On
Labels Off
Annotations Off
Buffer_Size 0
Use_Kubelet true
We could records are not completely processed by Fluent-bit.
Validated the Input Storage overlimit fluent-bit metrics they looks normal
No Overlimit reached in logs and errors recorded