output: add metrics for dropped oldest chunk count#4981
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Signed-off-by: Shizuo Fujita <fujita@clear-code.com>
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Which issue(s) this PR fixes:
Fixes #
What this PR does / why we need it:
When
overflow_action drop_oldest_chunkis configured, the oldest buffer chunk will be automatically discarded when the total buffer capacity is exhausted.This PR introduces a new metric,
drop_oldest_chunk_count, which counts the number of discarded chunks.Docs Changes:
fluent/fluentd-docs-gitbook#582
Release Note:
Same as the title