/
SumObserverMetric.ts
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/
SumObserverMetric.ts
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/*
* 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
*
* https://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.
*/
import * as api from '@opentelemetry/api-metrics';
import { InstrumentationLibrary } from '@opentelemetry/core';
import { Resource } from '@opentelemetry/resources';
import { BaseObserverMetric } from './BaseObserverMetric';
import { Processor } from './export/Processor';
import { LastValue, MetricKind } from './export/types';
import { ObserverResult } from './ObserverResult';
/** This is a SDK implementation of SumObserver Metric. */
export class SumObserverMetric
extends BaseObserverMetric
implements api.SumObserver {
constructor(
name: string,
options: api.MetricOptions,
processor: Processor,
resource: Resource,
instrumentationLibrary: InstrumentationLibrary,
callback?: (observerResult: api.ObserverResult) => unknown
) {
super(
name,
options,
processor,
resource,
MetricKind.SUM_OBSERVER,
instrumentationLibrary,
callback
);
}
protected override _processResults(observerResult: ObserverResult): void {
observerResult.values.forEach((value, labels) => {
const instrument = this.bind(labels);
// SumObserver is monotonic which means it should only accept values
// greater or equal then previous value
const previous = instrument.getAggregator().toPoint();
let previousValue = -Infinity;
if (previous.timestamp[0] !== 0 || previous.timestamp[1] !== 0) {
previousValue = previous.value as LastValue;
}
if (value >= previousValue) {
instrument.update(value);
}
});
}
}