github.com/inspektor-gadget/inspektor-gadget@v0.28.1/pkg/operators/prometheus/view.go (about)

     1  // Copyright 2023 The Inspektor Gadget authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package prometheus
    16  
    17  import (
    18  	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
    19  )
    20  
    21  // histogramViewFunc returns a view function for a histogram instrument.
    22  // It allows using custom aggregation (e.g histogram buckets) for a given instrument.
    23  func (p *Prometheus) histogramViewFunc() sdkmetric.View {
    24  	return func(instrument sdkmetric.Instrument) (sdkmetric.Stream, bool) {
    25  		if instrument.Kind != sdkmetric.InstrumentKindHistogram {
    26  			return sdkmetric.Stream{}, false
    27  		}
    28  		bc, ok := p.bucketConfigs[instrument.Name]
    29  		if !ok {
    30  			return sdkmetric.Stream{}, false
    31  		}
    32  		return sdkmetric.Stream{
    33  			Name:        instrument.Name,
    34  			Description: instrument.Description,
    35  			Unit:        instrument.Unit,
    36  			Aggregation: sdkmetric.AggregationExplicitBucketHistogram{
    37  				Boundaries: bc.buckets(),
    38  			},
    39  		}, true
    40  	}
    41  }