OTLP change default port number

From specification - open-telemetry/opentelemetry-specification#1221

examples/otlp/README.md

@@ -15,7 +15,7 @@ receivers:
   otlp:
     protocols:
       grpc:
-        endpoint: localhost:55680
+        endpoint: localhost:4317
 exporters:
   zipkin:
     endpoint: "http://localhost:9411/api/v2/spans"
@@ -26,6 +26,6 @@ service:
       exporters: [zipkin]
 ```
 
-Note that the OTLP exporter connects to the Collector at `localhost:55680` by default. This can be changed with first argument from command-line, for example: `./example_otlp gateway.docker.internal:55680`.
+Note that the OTLP exporter connects to the Collector at `localhost:4317` by default. This can be changed with first argument from command-line, for example: `./example_otlp gateway.docker.internal:4317`.
 
 Once you have the Collector running, see [CONTRIBUTING.md](../../CONTRIBUTING.md) for instructions on building and running the example.

exporters/otlp/README.md

@@ -18,9 +18,9 @@ auto exporter = std::unique_ptr<sdktrace::SpanExporter>(new otlp::OtlpExporter(o
 
 ### Configuration options
 
-| Option       | Default           |
-| ------------ |------------------ |
-| `endpoint`   | `localhost:55680` |
+| Option       | Default          |
+| ------------ |----------------- |
+| `endpoint`   | `localhost:4317` |
 
 ## Example
 

exporters/otlp/include/opentelemetry/exporters/otlp/otlp_exporter.h

@@ -14,7 +14,7 @@ namespace otlp
 struct OtlpExporterOptions
 {
   // The endpoint to export to. By default the OpenTelemetry Collector's default endpoint.
-  std::string endpoint = "localhost:55680";
+  std::string endpoint = "localhost:4317";
 };
 
 /**