feat(exporter-zipkin)!: do not read environment variables from window (#5465)

Author: pichlermarc

CHANGELOG.md

@@ -93,6 +93,8 @@ For semantic convention package changes, see the [semconv CHANGELOG](packages/se
   * (user-facing): `baggageUtils.parsePairKeyValue` was an internal utility function that was unintentionally exported. It has been removed without replacement.
   * (user-facing): `TimeOriginLegacy` has been removed without replacement.
   * (user-facing): `isAttributeKey` was an internal utility function that was unintentionally exported. It has been removed without replacement.
+* feat(exporter-zipkin)!: do not read environment variables from window in browsers [#5465](https://github.com/open-telemetry/opentelemetry-js/pull/5465) @pichlermarc
+  * (user-facing): all configuration previously possible via `window.OTEL_*` is now not supported anymore, please pass configuration options to constructors instead.
 * feat(resource)!: Remove resource class export in favor of functions and types only to aid in cross-version compatibility [#5421](https://github.com/open-telemetry/opentelemetry-js/pull/5421)
   * Renames `Resource` class to `ResourceImpl` and makes it package-private
   * Renames `IResource` interface to `Resource`

packages/opentelemetry-exporter-zipkin/src/zipkin.ts

@@ -15,7 +15,11 @@
  */
 
 import { diag } from '@opentelemetry/api';
-import { ExportResult, ExportResultCode, getEnv } from '@opentelemetry/core';
+import {
+  ExportResult,
+  ExportResultCode,
+  getStringFromEnv,
+} from '@opentelemetry/core';
 import { SpanExporter, ReadableSpan } from '@opentelemetry/sdk-trace-base';
 import { prepareSend } from './platform/index';
 import * as zipkinTypes from './types';
@@ -42,7 +46,10 @@ export class ZipkinExporter implements SpanExporter {
   private _sendingPromises: Promise<unknown>[] = [];
 
   constructor(config: zipkinTypes.ExporterConfig = {}) {
-    this._urlStr = config.url || getEnv().OTEL_EXPORTER_ZIPKIN_ENDPOINT;
+    this._urlStr =
+      config.url ||
+      (getStringFromEnv('OTEL_EXPORTER_ZIPKIN_ENDPOINT') ??
+        'http://localhost:9411/api/v2/spans');
     this._send = prepareSend(this._urlStr, config.headers);
     this._serviceName = config.serviceName;
     this._statusCodeTagName =