feat: Rename Labels to Attributes (#2523)

Co-authored-by: Daniel Dyla <dyladan@users.noreply.github.com>

experimental/packages/opentelemetry-api-metrics/src/NoopMeter.ts

@@ -17,7 +17,7 @@
 import { Meter } from './types/Meter';
 import {
   MetricOptions,
-  Labels,
+  Attributes,
   Counter,
   Histogram,
   ObservableGauge,
@@ -109,15 +109,15 @@ export class NoopMeter implements Meter {
 export class NoopMetric {}
 
 export class NoopCounterMetric extends NoopMetric implements Counter {
-  add(_value: number, _labels: Labels): void {}
+  add(_value: number, _attributes: Attributes): void {}
 }
 
 export class NoopUpDownCounterMetric extends NoopMetric implements UpDownCounter {
-  add(_value: number, _labels: Labels): void {}
+  add(_value: number, _attributes: Attributes): void {}
 }
 
 export class NoopHistogramMetric extends NoopMetric implements Histogram {
-  record(_value: number, _labels: Labels): void {}
+  record(_value: number, _attributes: Attributes): void {}
 }
 
 export class NoopObservableBaseMetric extends NoopMetric implements ObservableBase {

experimental/packages/opentelemetry-api-metrics/src/types/Meter.ts

@@ -39,7 +39,7 @@ export interface MeterOptions {
  * An interface to allow the recording metrics.
  *
  * {@link Metric}s are used for recording pre-defined aggregation (`Counter`),
- * or raw values (`Histogram`) in which the aggregation and labels
+ * or raw values (`Histogram`) in which the aggregation and attributes
  * for the exported metric are deferred.
  */
 export interface Meter {

experimental/packages/opentelemetry-api-metrics/src/types/Metric.ts

@@ -37,8 +37,8 @@ export interface MetricOptions {
    */
   unit?: string;
 
-  /** The map of constant labels for the Metric. */
-  constantLabels?: Map<string, string>;
+  /** The map of constant attributes for the Metric. */
+  constantAttributes?: Map<string, string>;
 
   /**
    * Indicates the metric is a verbose metric that is disabled by default
@@ -93,30 +93,30 @@ export enum AggregationTemporality {
  */
 export interface Counter {
   /**
-   * Adds the given value to the current value. Values cannot be negative.
+   * Increment value of counter by the input. Inputs may not be negative.
    */
-  add(value: number, labels?: Labels): void;
+  add(value: number, attributes?: Attributes): void;
 }
 
 export interface UpDownCounter {
   /**
-   * Adds the given value to the current value. Values can be negative.
+   * Increment value of counter by the input. Inputs may be negative.
    */
-  add(value: number, labels?: Labels): void;
+  add(value: number, attributes?: Attributes): void;
 }
 
 export interface Histogram {
   /**
    * Records the given value to this histogram.
    */
-  record(value: number, labels?: Labels): void;
+  record(value: number, attributes?: Attributes): void;
 }
 
 /** Base interface for the Observable metrics. */
 export interface ObservableBase {
   observation: (
     value: number,
-    labels?: Labels,
+    attributes?: Attributes,
   ) => Observation;
 }
 
@@ -132,4 +132,4 @@ export type ObservableCounter = ObservableBase;
 /**
  * key-value pairs passed by the user.
  */
-export type Labels = { [key: string]: string };
+export type Attributes = { [key: string]: string };

experimental/packages/opentelemetry-api-metrics/src/types/ObservableResult.ts

@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-import { Labels } from './Metric';
+import { Attributes } from './Metric';
 
 /**
  * Interface that is being used in callback function for Observable Metric
  */
 export interface ObservableResult {
-  observe(value: number, labels: Labels): void;
+  observe(value: number, attributes: Attributes): void;
 }

experimental/packages/opentelemetry-api-metrics/test/noop-implementations/noop-meter.test.ts

@@ -25,16 +25,16 @@ describe('NoopMeter', () => {
   it('should not crash', () => {
     const meter = new NoopMeterProvider().getMeter('test-noop');
     const counter = meter.createCounter('some-name');
-    const labels = {};
+    const attributes = {};
 
     // ensure NoopMetric does not crash.
-    counter.add(1, labels);
+    counter.add(1, attributes);
 
     // ensure the correct noop const is returned
     assert.strictEqual(counter, NOOP_COUNTER_METRIC);
 
     const histogram = meter.createHistogram('some-name');
-    histogram.record(1, labels);
+    histogram.record(1, attributes);
 
     // ensure the correct noop const is returned
     assert.strictEqual(histogram, NOOP_HISTOGRAM_METRIC);

experimental/packages/opentelemetry-exporter-metrics-otlp-http/src/transformMetrics.ts

@@ -15,7 +15,7 @@
  */
 
 import { SpanAttributes, HrTime } from '@opentelemetry/api';
-import { Labels, ValueType } from '@opentelemetry/api-metrics';
+import { Attributes as Labels, ValueType } from '@opentelemetry/api-metrics';
 import * as core from '@opentelemetry/core';
 import {
   AggregatorKind,
@@ -54,7 +54,7 @@ export function toAggregationTemporality(
 }
 
 /**
- * Returns an DataPoint which can have integers or doublle values
+ * Returns an DataPoint which can have integers or double values
  * @param metric
  * @param startTime
  */
@@ -63,7 +63,7 @@ export function toDataPoint(
   startTime: number
 ): otlpTypes.opentelemetryProto.metrics.v1.DataPoint {
   return {
-    labels: toCollectorLabels(metric.labels),
+    labels: toCollectorLabels(metric.attributes),
     value: metric.aggregator.toPoint().value as number,
     startTimeUnixNano: startTime,
     timeUnixNano: core.hrTimeToNanoseconds(
@@ -86,7 +86,7 @@ export function toHistogramPoint(
     timestamp: HrTime;
   };
   return {
-    labels: toCollectorLabels(metric.labels),
+    labels: toCollectorLabels(metric.attributes),
     sum: value.sum,
     count: value.count,
     startTimeUnixNano: startTime,

experimental/packages/opentelemetry-exporter-metrics-otlp-http/test/common/transformMetrics.test.ts

@@ -158,7 +158,7 @@ describe('transformMetrics', () => {
       );
     });
 
-    it('should convert metric labels value to string', () => {
+    it('should convert metric attributes value to string', () => {
       const metric = transform.toCollectorMetric(
         {
           descriptor: {
@@ -168,7 +168,7 @@ describe('transformMetrics', () => {
             metricKind: 0,
             valueType: 0,
           },
-          labels: { foo: (1 as unknown) as string },
+          attributes: { foo: (1 as unknown) as string },
           aggregator: new SumAggregator(),
           resource: new Resource({}),
           aggregationTemporality: 0,

experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusLabelsBatcher.ts → experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusAttributesBatcher.ts

@@ -26,7 +26,7 @@ interface BatcherCheckpoint {
   records: Map<string, MetricRecord>;
 }
 
-export class PrometheusLabelsBatcher {
+export class PrometheusAttributesBatcher {
   private _batchMap = new Map<string, BatcherCheckpoint>();
 
   get hasMetric(): boolean {
@@ -45,10 +45,10 @@ export class PrometheusLabelsBatcher {
       this._batchMap.set(name, item);
     }
     const recordMap = item.records;
-    const labels = Object.keys(record.labels)
-      .map(k => `${k}=${record.labels[k]}`)
+    const attributes = Object.keys(record.attributes)
+      .map(k => `${k}=${record.attributes[k]}`)
       .join(',');
-    recordMap.set(labels, record);
+    recordMap.set(attributes, record);
   }
 
   checkPointSet(): PrometheusCheckpoint[] {

experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusExporter.ts

@@ -25,7 +25,7 @@ import { createServer, IncomingMessage, Server, ServerResponse } from 'http';
 import * as url from 'url';
 import { ExporterConfig } from './export/types';
 import { PrometheusSerializer } from './PrometheusSerializer';
-import { PrometheusLabelsBatcher } from './PrometheusLabelsBatcher';
+import { PrometheusAttributesBatcher } from './PrometheusAttributesBatcher';
 
 export class PrometheusExporter implements MetricExporter {
   static readonly DEFAULT_OPTIONS = {
@@ -43,10 +43,10 @@ export class PrometheusExporter implements MetricExporter {
   private readonly _prefix?: string;
   private readonly _appendTimestamp: boolean;
   private _serializer: PrometheusSerializer;
-  private _batcher = new PrometheusLabelsBatcher();
+  private _batcher = new PrometheusAttributesBatcher();
 
   // This will be required when histogram is implemented. Leaving here so it is not forgotten
-  // Histogram cannot have a label named 'le'
+  // Histogram cannot have a attribute named 'le'
   // private static readonly RESERVED_HISTOGRAM_LABEL = 'le';
 
   /**

experimental/packages/opentelemetry-exporter-prometheus/src/PrometheusSerializer.ts

@@ -19,7 +19,7 @@ import {
   MetricKind,
 } from '@opentelemetry/sdk-metrics-base';
 import { PrometheusCheckpoint } from './types';
-import { Labels } from '@opentelemetry/api-metrics';
+import { Attributes } from '@opentelemetry/api-metrics';
 import { hrTimeToMilliseconds } from '@opentelemetry/core';
 
 type PrometheusDataTypeLiteral =
@@ -33,7 +33,7 @@ function escapeString(str: string) {
   return str.replace(/\\/g, '\\\\').replace(/\n/g, '\\n');
 }
 
-function escapeLabelValue(str: string) {
+function escapeAttributeValue(str: string) {
   if (typeof str !== 'string') {
     str = String(str);
   }
@@ -45,7 +45,7 @@ const invalidCharacterRegex = /[^a-z0-9_]/gi;
  * Ensures metric names are valid Prometheus metric names by removing
  * characters allowed by OpenTelemetry but disallowed by Prometheus.
  *
- * https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels
+ * https://prometheus.io/docs/concepts/data_model/#metric-names-and-attributes
  *
  * 1. Names must match `[a-zA-Z_:][a-zA-Z0-9_:]*`
  *
@@ -123,33 +123,33 @@ function toPrometheusType(
 
 function stringify(
   metricName: string,
-  labels: Labels,
+  attributes: Attributes,
   value: number,
   timestamp?: number,
-  additionalLabels?: Labels
+  additionalAttributes?: Attributes
 ) {
-  let hasLabel = false;
-  let labelsStr = '';
+  let hasAttribute = false;
+  let attributesStr = '';
 
-  for (const [key, val] of Object.entries(labels)) {
-    const sanitizedLabelName = sanitizePrometheusMetricName(key);
-    hasLabel = true;
-    labelsStr += `${
-      labelsStr.length > 0 ? ',' : ''
-    }${sanitizedLabelName}="${escapeLabelValue(val)}"`;
+  for (const [key, val] of Object.entries(attributes)) {
+    const sanitizedAttributeName = sanitizePrometheusMetricName(key);
+    hasAttribute = true;
+    attributesStr += `${
+      attributesStr.length > 0 ? ',' : ''
+    }${sanitizedAttributeName}="${escapeAttributeValue(val)}"`;
   }
-  if (additionalLabels) {
-    for (const [key, val] of Object.entries(additionalLabels)) {
-      const sanitizedLabelName = sanitizePrometheusMetricName(key);
-      hasLabel = true;
-      labelsStr += `${
-        labelsStr.length > 0 ? ',' : ''
-      }${sanitizedLabelName}="${escapeLabelValue(val)}"`;
+  if (additionalAttributes) {
+    for (const [key, val] of Object.entries(additionalAttributes)) {
+      const sanitizedAttributeName = sanitizePrometheusMetricName(key);
+      hasAttribute = true;
+      attributesStr += `${
+        attributesStr.length > 0 ? ',' : ''
+      }${sanitizedAttributeName}="${escapeAttributeValue(val)}"`;
     }
   }
 
-  if (hasLabel) {
-    metricName += `{${labelsStr}}`;
+  if (hasAttribute) {
+    metricName += `{${attributesStr}}`;
   }
 
   return `${metricName} ${valueString(value)}${
@@ -219,7 +219,7 @@ export class PrometheusSerializer {
         const timestamp = hrTimeToMilliseconds(hrtime);
         results += stringify(
           name,
-          record.labels,
+          record.attributes,
           value,
           this._appendTimestamp ? timestamp : undefined,
           undefined
@@ -233,7 +233,7 @@ export class PrometheusSerializer {
         for (const key of ['count', 'sum'] as ('count' | 'sum')[]) {
           results += stringify(
             name + '_' + key,
-            record.labels,
+            record.attributes,
             value[key],
             this._appendTimestamp ? timestamp : undefined,
             undefined
@@ -260,7 +260,7 @@ export class PrometheusSerializer {
           }
           results += stringify(
             name + '_bucket',
-            record.labels,
+            record.attributes,
             cumulativeSum,
             this._appendTimestamp ? timestamp : undefined,
             {

experimental/packages/opentelemetry-exporter-prometheus/test/ExactProcessor.ts

@@ -41,9 +41,9 @@ export class ExactProcessor<T, R extends Aggregator> extends Processor {
   }
 
   process(record: MetricRecord): void {
-    const labels = Object.keys(record.labels)
-      .map(k => `${k}=${record.labels[k]}`)
+    const attributes = Object.keys(record.attributes)
+      .map(k => `${k}=${record.attributes[k]}`)
       .join(',');
-    this._batchMap.set(record.descriptor.name + labels, record);
+    this._batchMap.set(record.descriptor.name + attributes, record);
   }
 }