mirror of
https://github.com/superseriousbusiness/gotosocial.git
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78defcd916
- codeberg.org/gruf/go-ffmpreg: v0.6.9 -> v0.6.10
- github.com/ncruces/go-sqlite3: v0.27.1 -> v0.28.0
- github.com/stretchr/testify: v1.10.0 -> v1.11.1
- github.com/tdewolff/minify/v2 v2.23.11 -> v2.24.2
- go.opentelemetry.io/otel{,/*}: v1.37.0 -> v1.38.0
- go.opentelemetry.io/contrib/*: v0.62.0 -> v0.63.0
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4406
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>
77 lines
3.3 KiB
Go
77 lines
3.3 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package metric // import "go.opentelemetry.io/otel/sdk/metric"
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import (
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"runtime"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/metric/exemplar"
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"go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
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)
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// ExemplarReservoirProviderSelector selects the
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// [exemplar.ReservoirProvider] to use
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// based on the [Aggregation] of the metric.
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type ExemplarReservoirProviderSelector func(Aggregation) exemplar.ReservoirProvider
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// reservoirFunc returns the appropriately configured exemplar reservoir
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// creation func based on the passed InstrumentKind and filter configuration.
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func reservoirFunc[N int64 | float64](
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provider exemplar.ReservoirProvider,
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filter exemplar.Filter,
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) func(attribute.Set) aggregate.FilteredExemplarReservoir[N] {
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return func(attrs attribute.Set) aggregate.FilteredExemplarReservoir[N] {
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return aggregate.NewFilteredExemplarReservoir[N](filter, provider(attrs))
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}
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}
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// DefaultExemplarReservoirProviderSelector returns the default
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// [exemplar.ReservoirProvider] for the
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// provided [Aggregation].
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//
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// For explicit bucket histograms with more than 1 bucket, it uses the
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// [exemplar.HistogramReservoirProvider].
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// For exponential histograms, it uses the
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// [exemplar.FixedSizeReservoirProvider]
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// with a size of min(20, max_buckets).
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// For all other aggregations, it uses the
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// [exemplar.FixedSizeReservoirProvider]
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// with a size equal to the number of CPUs.
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//
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// Exemplar default reservoirs MAY change in a minor version bump. No
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// guarantees are made on the shape or statistical properties of returned
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// exemplars.
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func DefaultExemplarReservoirProviderSelector(agg Aggregation) exemplar.ReservoirProvider {
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// https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/metrics/sdk.md#exemplar-defaults
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// Explicit bucket histogram aggregation with more than 1 bucket will
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// use AlignedHistogramBucketExemplarReservoir.
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a, ok := agg.(AggregationExplicitBucketHistogram)
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if ok && len(a.Boundaries) > 0 {
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return exemplar.HistogramReservoirProvider(a.Boundaries)
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}
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var n int
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if a, ok := agg.(AggregationBase2ExponentialHistogram); ok {
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// Base2 Exponential Histogram Aggregation SHOULD use a
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// SimpleFixedSizeExemplarReservoir with a reservoir equal to the
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// smaller of the maximum number of buckets configured on the
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// aggregation or twenty (e.g. min(20, max_buckets)).
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n = min(int(a.MaxSize), 20)
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} else {
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// https://github.com/open-telemetry/opentelemetry-specification/blob/e94af89e3d0c01de30127a0f423e912f6cda7bed/specification/metrics/sdk.md#simplefixedsizeexemplarreservoir
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// This Exemplar reservoir MAY take a configuration parameter for
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// the size of the reservoir. If no size configuration is
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// provided, the default size MAY be the number of possible
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// concurrent threads (e.g. number of CPUs) to help reduce
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// contention. Otherwise, a default size of 1 SHOULD be used.
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//
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// Use runtime.GOMAXPROCS instead of runtime.NumCPU to support
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// containerized environments that may have less than the total number
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// of logical CPUs available on the local machine allocated to it.
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n = max(runtime.GOMAXPROCS(0), 1)
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}
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return exemplar.FixedSizeReservoirProvider(n)
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}
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