diff options
Diffstat (limited to 'vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go')
| -rw-r--r-- | vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go | 109 |
1 files changed, 47 insertions, 62 deletions
diff --git a/vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go b/vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go index 3f1ce9f1d..82619da78 100644 --- a/vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go +++ b/vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go @@ -1,22 +1,12 @@ // Copyright The OpenTelemetry Authors -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. +// SPDX-License-Identifier: Apache-2.0 package metric // import "go.opentelemetry.io/otel/sdk/metric" import ( "os" "runtime" + "slices" "go.opentelemetry.io/otel/sdk/metric/internal/exemplar" "go.opentelemetry.io/otel/sdk/metric/internal/x" @@ -29,68 +19,63 @@ import ( // Note: This will only return non-nil values when the experimental exemplar // feature is enabled and the OTEL_METRICS_EXEMPLAR_FILTER environment variable // is not set to always_off. -func reservoirFunc[N int64 | float64](agg Aggregation) func() exemplar.Reservoir[N] { +func reservoirFunc[N int64 | float64](agg Aggregation) func() exemplar.FilteredReservoir[N] { if !x.Exemplars.Enabled() { return nil } - - // https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/metrics/sdk.md#exemplar-defaults - resF := func() func() exemplar.Reservoir[N] { - // Explicit bucket histogram aggregation with more than 1 bucket will - // use AlignedHistogramBucketExemplarReservoir. - a, ok := agg.(AggregationExplicitBucketHistogram) - if ok && len(a.Boundaries) > 0 { - cp := make([]float64, len(a.Boundaries)) - copy(cp, a.Boundaries) - return func() exemplar.Reservoir[N] { - bounds := cp - return exemplar.Histogram[N](bounds) - } - } - - var n int - if a, ok := agg.(AggregationBase2ExponentialHistogram); ok { - // Base2 Exponential Histogram Aggregation SHOULD use a - // SimpleFixedSizeExemplarReservoir with a reservoir equal to the - // smaller of the maximum number of buckets configured on the - // aggregation or twenty (e.g. min(20, max_buckets)). - n = int(a.MaxSize) - if n > 20 { - n = 20 - } - } else { - // https://github.com/open-telemetry/opentelemetry-specification/blob/e94af89e3d0c01de30127a0f423e912f6cda7bed/specification/metrics/sdk.md#simplefixedsizeexemplarreservoir - // This Exemplar reservoir MAY take a configuration parameter for - // the size of the reservoir. If no size configuration is - // provided, the default size MAY be the number of possible - // concurrent threads (e.g. number of CPUs) to help reduce - // contention. Otherwise, a default size of 1 SHOULD be used. - n = runtime.NumCPU() - if n < 1 { - // Should never be the case, but be defensive. - n = 1 - } - } - - return func() exemplar.Reservoir[N] { - return exemplar.FixedSize[N](n) - } - } - // https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/configuration/sdk-environment-variables.md#exemplar const filterEnvKey = "OTEL_METRICS_EXEMPLAR_FILTER" + var filter exemplar.Filter + switch os.Getenv(filterEnvKey) { case "always_on": - return resF() + filter = exemplar.AlwaysOnFilter case "always_off": - return exemplar.Drop[N] + return exemplar.Drop case "trace_based": fallthrough default: - newR := resF() - return func() exemplar.Reservoir[N] { - return exemplar.SampledFilter(newR()) + filter = exemplar.SampledFilter + } + + // https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/metrics/sdk.md#exemplar-defaults + // Explicit bucket histogram aggregation with more than 1 bucket will + // use AlignedHistogramBucketExemplarReservoir. + a, ok := agg.(AggregationExplicitBucketHistogram) + if ok && len(a.Boundaries) > 0 { + cp := slices.Clone(a.Boundaries) + return func() exemplar.FilteredReservoir[N] { + bounds := cp + return exemplar.NewFilteredReservoir[N](filter, exemplar.Histogram(bounds)) } } + + var n int + if a, ok := agg.(AggregationBase2ExponentialHistogram); ok { + // Base2 Exponential Histogram Aggregation SHOULD use a + // SimpleFixedSizeExemplarReservoir with a reservoir equal to the + // smaller of the maximum number of buckets configured on the + // aggregation or twenty (e.g. min(20, max_buckets)). + n = int(a.MaxSize) + if n > 20 { + n = 20 + } + } else { + // https://github.com/open-telemetry/opentelemetry-specification/blob/e94af89e3d0c01de30127a0f423e912f6cda7bed/specification/metrics/sdk.md#simplefixedsizeexemplarreservoir + // This Exemplar reservoir MAY take a configuration parameter for + // the size of the reservoir. If no size configuration is + // provided, the default size MAY be the number of possible + // concurrent threads (e.g. number of CPUs) to help reduce + // contention. Otherwise, a default size of 1 SHOULD be used. + n = runtime.NumCPU() + if n < 1 { + // Should never be the case, but be defensive. + n = 1 + } + } + + return func() exemplar.FilteredReservoir[N] { + return exemplar.NewFilteredReservoir[N](filter, exemplar.FixedSize(n)) + } } |