Dump Internals / Signal
When the service is running we can export metrics to see the overall status of the data flow of the service. But there are other use cases where we would like to know the current status of the internals of the service, specifically to answer questions like what's the current status of the internal buffers ? , the Dump Internals feature is the answer.
Fluent Bit v1.4 introduces the Dump Internals feature that can be triggered easily from the command line triggering the CONT
Unix signal.
note: this feature is only available on Linux and BSD family operating systems
Usage
Run the following kill
command to signal Fluent Bit:
The command
pidof
aims to lookup the Process ID of Fluent Bit. You can replace the
Fluent Bit will dump the following information to the standard output interface (stdout):
Input Plugins Dump
The dump provides insights for every input instance configured.
Status
Overall ingestion status of the plugin.
Tasks
When an input plugin ingest data into the engine, a Chunk is created. A Chunk can contains multiple records. Upon flush time, the engine creates a Task that contains the routes for the Chunk associated in question.
The Task dump describes the tasks associated to the input plugin:
Chunks
The Chunks dump tells more details about all the chunks that the input plugin has generated and are still being processed.
Depending of the buffering strategy and limits imposed by configuration, some Chunks might be up
(in memory) or down
(filesystem).
Storage Layer Dump
Fluent Bit relies on a custom storage layer interface designed for hybrid buffering. The Storage Layer
entry contains a total summary of Chunks registered by Fluent Bit:
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