chore: add changes to README and revert other changes

Author: brunoluiz

packages/opentelemetry-exporter-collector-grpc/README.md

@@ -28,7 +28,7 @@ const { CollectorTraceExporter } =  require('@opentelemetry/exporter-collector-g
 
 const collectorOptions = {
   // url is optional and can be omitted - default is grpc://localhost:4317
-  url: '<collector-hostname>:<port>',
+  url: 'grpc://<collector-hostname>:<port>',
 };
 
 const provider = new BasicTracerProvider();
@@ -52,7 +52,7 @@ const { CollectorTraceExporter } =  require('@opentelemetry/exporter-collector-g
 
 const collectorOptions = {
   // url is optional and can be omitted - default is grpc://localhost:4317
-  url: '<collector-hostname>:<port>',
+  url: 'grpc://<collector-hostname>:<port>',
   credentials: grpc.credentials.createSsl(),
 };
 
@@ -92,7 +92,7 @@ metadata.set('k', 'v');
 
 const collectorOptions = {
   // url is optional and can be omitted - default is grpc://localhost:4317
-  url: '<collector-hostname>:<port>',
+  url: 'grpc://<collector-hostname>:<port>',
   metadata, // // an optional grpc.Metadata object to be sent with each request
 };
 
@@ -117,7 +117,7 @@ const { MeterProvider } = require('@opentelemetry/metrics');
 const { CollectorMetricExporter } =  require('@opentelemetry/exporter-collector-grpc');
 const collectorOptions = {
   // url is optional and can be omitted - default is grpc://localhost:4317
-  url: '<collector-hostname>:<port>',
+  url: 'grpc://<collector-hostname>:<port>',
 };
 const exporter = new CollectorMetricExporter(collectorOptions);
 

packages/opentelemetry-exporter-collector-grpc/src/CollectorMetricExporter.ts

@@ -24,7 +24,7 @@ import { CollectorExporterNodeBase } from './CollectorExporterNodeBase';
 import { getEnv } from '@opentelemetry/core';
 import { validateAndNormalizeUrl } from './util';
 
-const DEFAULT_COLLECTOR_URL = 'grpc://localhost:4317';
+const DEFAULT_COLLECTOR_URL = 'localhost:4317';
 
 /**
  * Collector Metric Exporter for Node

packages/opentelemetry-exporter-collector-grpc/src/CollectorTraceExporter.ts

@@ -24,7 +24,7 @@ import { CollectorExporterConfigNode, ServiceClientType } from './types';
 import { getEnv } from '@opentelemetry/core';
 import { validateAndNormalizeUrl } from './util';
 
-const DEFAULT_COLLECTOR_URL = 'grpc://localhost:4317';
+const DEFAULT_COLLECTOR_URL = 'localhost:4317';
 
 /**
  * Collector Trace Exporter for Node

packages/opentelemetry-exporter-collector-grpc/test/CollectorMetricExporter.test.ts

@@ -242,7 +242,7 @@ describe('CollectorMetricExporter - node (getDefaultUrl)', () => {
   it('should default to localhost', done => {
     const collectorExporter = new CollectorMetricExporter({});
     setTimeout(() => {
-      assert.strictEqual(collectorExporter['url'], 'grpc://localhost:4317');
+      assert.strictEqual(collectorExporter['url'], 'localhost:4317');
       done();
     });
   });

packages/opentelemetry-exporter-collector-grpc/test/CollectorTraceExporter.test.ts

@@ -204,7 +204,7 @@ describe('CollectorTraceExporter - node (getDefaultUrl)', () => {
   it('should default to localhost', done => {
     const collectorExporter = new CollectorTraceExporter({});
     setTimeout(() => {
-      assert.strictEqual(collectorExporter['url'], 'grpc://localhost:4317');
+      assert.strictEqual(collectorExporter['url'], 'localhost:4317');
       done();
     });
   });