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@@ -234,29 +234,28 @@ The following are detailed descriptions for the metrics collected by the storage
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### Output latency metric
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> note: feature introduced in v4.0.6.
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The `fluentbit_output_latency_seconds` histogram metric captures end-to-end latency from the time a chunk is created by an input plugin until it is successfully delivered by an output plugin. This provides observability into chunk-level pipeline performance and helps identify slowdowns or bottlenecks in the output path.
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Introduced in Fluent Bit 4.0.6, the `fluentbit_output_latency_seconds` histogram metric captures end-to-end latency from the time a chunk is created by an input plugin until it's successfully delivered by an output plugin. This provides observability into chunk-level pipeline performance and helps identify slowdowns or bottlenecks in the output path.
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#### Bucket configuration
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The histogram uses the following default bucket boundaries, designed around Fluent Bit's typical flush interval of 1 second:
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The histogram uses the following default bucket boundaries, designed around the Fluent Bit typical flush interval of 1 second:
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```
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```text
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0.5, 1.0, 1.5, 2.5, 5.0, 10.0, 20.0, 30.0, +Inf
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```
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These boundaries provide:
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-**High resolution around 1s latency**: Captures normal operation near the default flush interval
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-**Small backpressure detection**: Identifies minor delays in the 1-2.5s range
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-**Bottleneck identification**: Detects retry cycles, network stalls, or plugin bottlenecks in higher ranges
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-**Complete coverage**: The `+Inf` bucket ensures all latencies are captured
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- High resolution around 1 s latency: Captures normal operation near the default flush interval.
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- Small backpressure detection: Identifies minor delays in the 1-2.5 s range.
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- Bottleneck identification: Detects retry cycles, network stalls, or plugin bottlenecks in higher ranges.
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- Complete coverage**: The `+Inf` bucket ensures all latencies are captured.
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#### Example output
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When exposed via Fluent Bit's built-in HTTP server, the metric appears in Prometheus format:
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When exposed through the Fluent Bit built-in HTTP server, the metric appears in Prometheus format:
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```prometheus
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```text
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# HELP fluentbit_output_latency_seconds End-to-end latency in seconds
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