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Description
Details
I have Fluentd set up to forward logs to Kafka. In some of the Prometheus metrics for the buffers of those Kafka output plugins, I'm seeing negative values. Specifically, I'm seeing negative values for the following metrics:
fluentd_output_status_buffer_total_bytesfluentd_output_status_buffer_stage_byte_size
Eg.
fluentd_output_status_buffer_total_bytes{worker_id="3",plugin_id="kafka_output",type="kafka2"} -7897834.0
fluentd_output_status_buffer_stage_byte_size{worker_id="3",plugin_id="kafka_output",type="kafka2"} -7897834.0
This appears to be the same issue as fluent/fluent-plugin-prometheus#55, open since 2018.
Prometheus Config
<source>
@type prometheus
port 24240
metrics_path /metrics
aggregated_metrics_path /aggregated_metrics
</source>
<source>
@type prometheus_output_monitor
</source>
Env Info
- Fluentd:
1.11.2 - fluent-plugin-prometheus:
1.8.2 - fluent-plugin-prometheus_pushgateway:
0.0.2 - fluent-plugin-kafka:
0.14.1 - Note that Fluentd has multi-process workers enabled