Mailer
Operations

Metrics and Dashboard

Prometheus metrics and dashboard metadata.

Mailer records metrics during execution and exposes pipeline descriptions for a dashboard.

Stage and edge metrics

MetricMeaning
mailer_edge_queue_sizeCurrent queue depth for a bounded edge.
mailer_edge_queue_capacityConfigured edge capacity.
mailer_stage_records_in_totalRecords entering each stage.
mailer_stage_records_out_totalRecords leaving each stage.
mailer_stage_send_block_seconds_totalTime blocked by downstream backpressure.
mailer_stage_workersWorker count for stage.
mailer_stage_errors_totalStage errors.

Operator labels

SDK labels and workflow operator ids are used in descriptions and dashboard metadata.

stream.Filter(isCompleted, "completed")
- id: completed
  type: filter

Secret hygiene

Pipeline descriptions and dashboard metadata must not include resolved secret values. Workflow compilation keeps sensitive values out of graph descriptions.

On this page