bert-beyondloops opened a new issue, #21146:
URL: https://github.com/apache/datafusion/issues/21146
### Is your feature request related to a problem or challenge?
There is currently no way to programmatically inspect the memory consumption
of individual consumers tracked by TrackConsumersPool. The only available
method, report_top(), returns a formatted string intended for human-readable
output, making it unsuitable for programmatic use (e.g., metrics collection,
monitoring, or custom reporting).
### Describe the solution you'd like
Add a metrics() method to TrackConsumersPool that returns a
Vec<MemoryConsumerMetrics> — a snapshot of all currently tracked consumers.
Each MemoryConsumerMetrics entry exposes:
- name — the consumer's name
- can_spill — whether the consumer supports spilling to disk
- reserved — current bytes reserved
- peak — peak bytes reserved
This allows callers to inspect memory usage programmatically without
parsing formatted strings.
### Describe alternatives you've considered
_No response_
### Additional context
This is useful for embedding DataFusion in systems that want to expose
per-operator memory metrics through their own observability pipelines (e.g.,
Prometheus, OpenTelemetry or custom dashboards).
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