How to Prevent Fluent Bit's Tail Input from Missing Log Lines
If Fluent Bit's tail input only captures the initial lines of your log files and does not capture subsequent entries until a restart, the problem is likely due to how file changes are being monitored.
To resolve this, enable the Inotify_Watcher option. This tells Fluent Bit to leverage Linux's notify mechanism to detect file changes in real time.
Here's how to configure it:
[INPUT]
Name tail
Path /var/log/myapp/*.log
Tag myapp.*
Inotify_Watcher On
[OUTPUT]
Name stdout
Match myapp.*
When you enable the Inotify_Watcher, Fluent Bit will immediately capture every new log line as it's written, even during file rotations, without needing continuous polling.
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