otel: add support for scope metrics (#7063)

Author: mabdinur

packages/dd-trace/src/opentelemetry/metrics/meter_provider.js

@@ -39,12 +39,12 @@ class MeterProvider {
    * @param {MeterOptions} [options] - Additional options
    * @returns {Meter} Meter instance
    */
-  getMeter (name, version = '', { schemaUrl = '' } = {}) {
+  getMeter (name, version = '', { schemaUrl = '', attributes = {} } = {}) {
     const normalizedName = name.toLowerCase()
     const key = `${normalizedName}@${version}@${schemaUrl}`
     let meter = this.#meters.get(key)
     if (!meter) {
-      meter = new Meter(this, { name: normalizedName, version, schemaUrl })
+      meter = new Meter(this, { name: normalizedName, version, schemaUrl, attributes })
       this.#meters.set(key, meter)
     }
     return meter

packages/dd-trace/test/opentelemetry/metrics.spec.js

@@ -633,6 +633,26 @@ describe('OpenTelemetry Meter Provider', () => {
 
       setTimeout(() => { validator(); done() }, 150)
     })
+
+    it('includes attributes in instrumentation scope', (done) => {
+      const validator = mockOtlpExport((decoded) => {
+        const scopeMetrics = decoded.resourceMetrics[0].scopeMetrics[0]
+        assert.strictEqual(scopeMetrics.metrics.length, 2)
+        const scopeAttributes = scopeMetrics.scope.attributes
+        assert.strictEqual(scopeAttributes.length, 2)
+        const usernameAttr = scopeAttributes.find(a => a.key === 'username')
+        const idAttr = scopeAttributes.find(a => a.key === 'id')
+        assert.strictEqual(usernameAttr?.value.stringValue, 'test')
+        assert.strictEqual(idAttr?.value.intValue, 23)
+      })
+
+      setupTracer()
+      const meter = metrics.getMeter('app', '', { attributes: { username: 'test', id: 23 } })
+      meter.createCounter('num.monkies').add(1)
+      meter.createCounter('num.baboons').add(2)
+
+      setTimeout(() => { validator(); done() }, 150)
+    })
   })
 
   describe('Unimplemented Features', () => {