out_kafka: emit a metric when librdkafka signals an error #9588
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Curl output showing the metric using a config that's intentionally broken (bad auth). As you can see no dropped records according to existing metrics, but the new metric shows the errors. |
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The async nature of the kafka output makes the fluentbit_output_dropped_records_total insufficient to determine whether there are problems sending messages to kafka. fluent-bit considers a message delivered when it has been added to the librdkafka buffers. If librdkafka subsequently fails to deliver the message, the only feedback is a log message such as: ``` [2024/11/12 07:56:45] [ warn] [output:kafka:azure] message delivery failed: Local: Message timed out ``` So let's add a metric that exposes how often librdkafka signals that it has problems talking to kafka. Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net>
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