Module metrics 

Metrics for recording information about execution

Structs

BaselineMetrics

Helper for creating and tracking common “baseline” metrics for each operator

Count

A counter to record things such as number of input or output rows

ElapsedComputeFuture

Wraps any Future and accumulates the wall-clock time spent inside each Future::poll call into elapsed_compute. Everything that executes synchronously within a poll() scope is measured — including CPU-bound work, memory copies, and any blocking the future performs before returning. Time between polls (when the runtime has suspended the future waiting for I/O, a channel, or a waker) is not measured.

ExecutionPlanMetricsSet

A set of Metrics for an individual operator.

ExpressionEvaluatorMetrics

Tracks evaluation time for a sequence of expressions.

Gauge

A gauge is the simplest metrics type. It just returns a value. For example, you can easily expose current memory consumption with a gauge.

Label

name=value pairs identifying a metric. This concept is called various things in various different systems:

LabelValue

A label name or value.

Metric

Something that tracks a value of interest (metric) during execution.

MetricBuilder

Structure for constructing metrics, counters, timers, etc.

MetricsSet

A snapshot of the metrics for a particular execution plan.

PruningMetrics

Counters tracking pruning metrics

RatioMetrics

Counters tracking ratio metrics (e.g. matched vs total)

ScopedTimerGuard

RAAI structure that adds all time between its construction and destruction to the CPU time or the first call to stop whichever comes first

SpillMetrics

Helper for creating and tracking spill-related metrics for each operator

SplitMetrics

Metrics for tracking batch splitting activity

Time

Measure a potentially non contiguous duration of time

Timestamp

Stores a single timestamp, stored as the number of nanoseconds elapsed from Jan 1, 1970 UTC

Enums

MetricCategory

Classifies a metric by what it measures.

MetricType

Categorizes metrics so the display layer can choose the desired verbosity.

MetricValue

Possible values for a super::Metric.

RatioMergeStrategy

Traits

CustomMetricValue

A trait for implementing custom metric values.

ElapsedComputeFutureExt

Extension trait that wraps any Future with ElapsedComputeFuture.

RecordOutput

Trait for things that produce output rows as a result of execution.