const CURATED: &[CuratedMetricSink];Expand description
The curated metric sinks, installed on every replica.
Sources read the raw ..._raw logging relations, not a derived view that re-aggregates them
(mz_dataflow_arrangement_sizes) or a join view over the logs (mz_dataflow_operator_dataflows),
for performance: those churn even on static data and their cost scales with the replica’s
dataflow-creation rate. A single-relation filter like mz_compute_exports carries no aggregation
and is read freely.
Every family sums across workers, so a series carries no worker_id, and a multi-process replica
reports one number per grouping key rather than one per process. The size families emit one series
per dataflow, the errors family one per export.