example/in_sample_blocks.conf
<source>
@type sample
tag sample
rate 100
sample {"message":"yaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay"}
</source>
<match sample>
@type null
never_flush true
<buffer>
@type memory
overflow_action block
chunk_limit_size 1k
total_limit_size 2k
</buffer>
</match>