chore(docs): update docs and changelog

Author: llc1123

experimental/CHANGELOG.md

@@ -20,6 +20,7 @@ All notable changes to experimental packages in this project will be documented
 * feat(otlp-metric-exporters): Add User-Agent header to OTLP metric exporters. [#3806](https://github.com/open-telemetry/opentelemetry-js/pull/3806) @JamieDanielson
 * feat(opencensus-shim): add OpenCensus trace shim [#3809](https://github.com/open-telemetry/opentelemetry-js/pull/3809) @aabmass
 * feat(exporter-logs-otlp-proto): protobuf exporter for logs. [#3779](https://github.com/open-telemetry/opentelemetry-js/pull/3779) @Abinet18
+* feat(otlp-grpc-exporters): add support for UDS endpoints. [#3853](https://github.com/open-telemetry/opentelemetry-js/pull/3853) @llc1123
 
 ### :bug: (Bug Fix)
 

experimental/packages/exporter-logs-otlp-grpc/README.md

@@ -34,6 +34,7 @@ import { OTLPLogExporter } from '@opentelemetry/exporter-logs-otlp-grpc';
 
 const collectorOptions = {
   // url is optional and can be omitted - default is http://localhost:4317
+  // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
   url: 'http://<collector-hostname>:<port>',
 };
 

experimental/packages/exporter-trace-otlp-grpc/README.md

@@ -30,6 +30,7 @@ const { OTLPTraceExporter } =  require('@opentelemetry/exporter-trace-otlp-grpc'
 
 const collectorOptions = {
   // url is optional and can be omitted - default is http://localhost:4317
+  // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
   url: 'http://<collector-hostname>:<port>',
 };
 
@@ -54,6 +55,7 @@ const { OTLPTraceExporter } =  require('@opentelemetry/exporter-trace-otlp-grpc'
 
 const collectorOptions = {
   // url is optional and can be omitted - default is http://localhost:4317
+  // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
   url: 'http://<collector-hostname>:<port>',
   credentials: grpc.credentials.createSsl(),
 };
@@ -94,6 +96,7 @@ metadata.set('k', 'v');
 
 const collectorOptions = {
   // url is optional and can be omitted - default is http://localhost:4317
+  // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
   url: 'http://<collector-hostname>:<port>',
   metadata, // // an optional grpc.Metadata object to be sent with each request
 };
@@ -120,6 +123,7 @@ The OTLPTraceExporter has a timeout configuration option which is the maximum ti
   const collectorOptions = {
     timeoutMillis: 15000,
     // url is optional and can be omitted - default is localhost:4317
+    // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
     url: '<collector-hostname>:<port>',
     metadata, // // an optional grpc.Metadata object to be sent with each request
   };
@@ -138,6 +142,7 @@ const { CompressionAlgorithm } = require('@opentelemetry/exporter-trace-otlp-grp
 
 const collectorOptions = {
   // url is optional and can be omitted - default is http://localhost:4317
+  // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
   url: 'http://<collector-hostname>:<port>',
   metadata, // // an optional grpc.Metadata object to be sent with each request
   compression: CompressionAlgorithm.GZIP,

experimental/packages/opentelemetry-exporter-metrics-otlp-grpc/README.md

@@ -32,6 +32,7 @@ const { MeterProvider, PeriodicExportingMetricReader } = require('@opentelemetry
 const { OTLPMetricExporter } = require('@opentelemetry/exporter-metrics-otlp-grpc');
 const collectorOptions = {
   // url is optional and can be omitted - default is http://localhost:4317
+  // Unix domain sockets are also supported: 'unix:///path/to/socket.sock'
   url: 'http://<collector-hostname>:<port>',
 };