fix: update metrics example (#1815)

* fix: update metrics example

* Update examples/metrics_sdk/metrics_collect.rb

Co-authored-by: Kayla Reopelle <87386821+kaylareopelle@users.noreply.github.com>

* Update examples/metrics_sdk/metrics_collect_otlp.rb

Co-authored-by: Kayla Reopelle <87386821+kaylareopelle@users.noreply.github.com>

---------

Co-authored-by: Kayla Reopelle <87386821+kaylareopelle@users.noreply.github.com>

Author: xuan-cao-swi

examples/metrics_sdk/README.md

@@ -32,8 +32,9 @@ receivers:
   otlp:
     protocols:
       grpc:
+        endpoint: 0.0.0.0:4317
       http:
-      # Default endpoints: 0.0.0.0:4317 for gRPC and 0.0.0.0:4318 for HTTP
+        endpoint: 0.0.0.0:4318
 
 exporters:
   debug:

examples/metrics_sdk/metrics_collect.rb

@@ -15,6 +15,9 @@
 require 'opentelemetry/sdk'
 require 'opentelemetry-metrics-sdk'
 
+# this example manually configures the exporter, turn off automatic configuration
+ENV['OTEL_METRICS_EXPORTER'] = 'none'
+
 OpenTelemetry::SDK.configure
 
 console_metric_exporter = OpenTelemetry::SDK::Metrics::Export::ConsoleMetricPullExporter.new

examples/metrics_sdk/metrics_collect_otlp.rb

@@ -18,6 +18,9 @@
 require 'opentelemetry-metrics-sdk'
 require 'opentelemetry-exporter-otlp-metrics'
 
+# this example manually configures the exporter, turn off automatic configuration
+ENV['OTEL_METRICS_EXPORTER'] = 'none'
+
 OpenTelemetry::SDK.configure
 
 otlp_metric_exporter = OpenTelemetry::Exporter::OTLP::Metrics::MetricsExporter.new