Module metrics 

Query execution metrics and stable diagnostic event rows.

Byte counters are device bytes unless the field name explicitly says host, Arrow, or Parquet compressed bytes.

Structs

BackendDurationProjectionError

A duration descriptor cannot project the backend’s nanosecond storage into its declared unit.

BackendMetricDescriptor

One backend metric’s immutable registration metadata.

BackendMetricLabel

A closed label domain. cardinality is a contract bound on the number of label values, set in the descriptor and not computed from observed samples. Stores must reject values outside the corresponding closed domain.

BoundaryMetrics

Host/device boundary transfer metrics.

BudgetedExecutionEvent

Successful lower-level execution-budget report captured as a metrics row.

DynamicFilterSourceSnapshot

Source-read row groups and bytes before or after applying a dynamic filter.

GraphAlgorithmRuntimeMetrics

cuGraph algorithm runtime metric row.

JoinOperatorMetrics

Join-specific operator metrics.

JoinStrategyDecisionMetrics

Join-strategy decision facts captured for diagnostics.

MetricDescriptor

Machine-readable descriptor for one query metric or exported evidence row set.

MetricsProjection

Provenance and completeness of metrics projected from an observation owner.

OperatorMetrics

Generic operator metric row.

QueryMetrics

Query-scoped metrics accumulated during native execution.

SourceReadParquetEvidenceMetrics

Lower-layer Parquet read evidence attached to a source-read metric row.

SourceReadRuntimeMetrics

Runtime evidence for one local-Parquet source read.

Enums

BackendMetric

Stable identities for the bounded backend descriptor registry.

BackendMetricKind

The storage semantics of a backend metric.

BackendMetricUnit

UCUM unit carried by a backend descriptor.

BackendMetricUpdatePoint

The lifecycle transition that owns a metric update.

MetricAggregation

How values for a metric are aggregated over a query.

MetricDirection

Directional health hint for metrics that have an obvious desired movement.

MetricUnit

Physical unit or logical value class for a diagnostic metric.

Constants

BACKEND_ATTEMPT_DURATION_BUCKETS_NS

Fixed histogram boundaries shared by the descriptor and backend store.

BACKEND_METRIC_DESCRIPTORS

Canonical backend descriptors in stable registration order.

QUERY_METRICS_JSON_SCHEMA

Identifies the layout of the JSON document QueryMetrics::to_json emits.

Functions

backend_metric_descriptors

Returns the descriptor registry in stable contract order.

project_backend_duration_histogram

Projects the duration descriptor’s internal nanosecond bounds and sum into its declared export unit.