config: don't log an error on close (#6299)

This is an expected outcome of the server shutdown being called, no need
to log an error about it.

---------

Signed-off-by: Alex Boten <223565+codeboten@users.noreply.github.com>

CHANGELOG.md

@@ -23,6 +23,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 - Upgrade `go.opentelemetry.io/otel/semconv/v1.17.0` to `go.opentelemetry.io/otel/semconv/v1.21.0` in `go.opentelemetry.io/contrib/instrumentation/go.mongodb.org/mongo-driver/mongo/otelmongo`. (#6272)
 - Resource doesn't merge with defaults if a valid resource is configured in `go.opentelemetry.io/contrib/config`. (#6289)
+- `otel.Handle` is no longer called on a successful shutdown of the Prometheus exporter in `go.opentelemetry.io/contrib/config`. (#6299)
 
 ### Fixed
 

config/metric.go

@@ -338,7 +338,7 @@ func prometheusReader(ctx context.Context, prometheusConfig *Prometheus) (sdkmet
 	}
 
 	go func() {
-		if err := server.Serve(lis); err != nil && errors.Is(err, http.ErrServerClosed) {
+		if err := server.Serve(lis); err != nil && !errors.Is(err, http.ErrServerClosed) {
 			otel.Handle(fmt.Errorf("the Prometheus HTTP server exited unexpectedly: %w", err))
 		}
 	}()