feat(streams): Add batch flush and GCS write pipeline metrics#312
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feat(streams): Add batch flush and GCS write pipeline metrics#312
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Record histograms for batch element count and open duration on flush, and a gauge for successful GCS object size keyed by route source. Co-authored-by: Cursor <cursoragent@cursor.com>
fpacifici
commented
May 7, 2026
- Rename batch size/time metrics; record batch age in milliseconds - Use histogram for GCS sink bytes; rename to sink.gcs_writer.bytes Co-authored-by: Cursor <cursoragent@cursor.com>
untitaker
approved these changes
May 7, 2026
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Expose Rust pipeline behavior to DogStatsD alongside existing
streams.pipeline.*stats: each batch flush samples window size and how long the window stayed open, and each successful GCS upload records the written object size.Batch flush
Batchrecordscreated_atwhen the first row opens the window. On successful flush, we emit histogramsstreams.pipeline.batch.size(element count) andstreams.pipeline.batch.time_ms(milliseconds since the batch opened), tagged withstep.GCS
After a successful upload, we record a histogram sample on
streams.pipeline.sink.gcs_writer.bytesfor the payload length, tagged withsourcefrom the writer route.