Fix plugin name

Signed-off-by: Shizuo Fujita <fujita@clear-code.com>

Author: Watson1978

example/README.md

@@ -5,8 +5,8 @@ for using Fluentd to export OpenTelemetry traces and metrics.
 
 The telemetry data have been provided by js application in `app` directory.
 
-* metrics.js: OpenTelemetry instrumented application that exports metrics to an endpoint (Fluentd) using the otlp protocol
-* tracing.js: OpenTelemetry instrumented application that exports trace data to an endpoint (Fluentd) using the otlp protocol
+* metrics.js: OpenTelemetry instrumented application that exports metrics to an endpoint (Fluentd) using the OpenTelemetry protocol
+* tracing.js: OpenTelemetry instrumented application that exports trace data to an endpoint (Fluentd) using the OpenTelemetry protocol
 
 ### Structure
 

example/fluentd/fluent.conf

@@ -1,6 +1,6 @@
 <source>
-  @type otlp
-  tag otlp
+  @type opentelemetry
+  tag opentelemetry
 
   # Experimental
   # <grpc>
@@ -14,8 +14,8 @@
   </http>
 </source>
 
-<match otlp.**>
-  @type otlp
+<match opentelemetry.**>
+  @type opentelemetry
   <buffer []>
     @type memory
     flush_mode immediate