Add Zap as the default error log in confighttp

.chloggen/zap-default-errorlog.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: confighttp
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Added Zap as the default error log in confighttp"
+
+# One or more tracking issues or pull requests related to the change
+issues: [11820]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

config/confighttp/confighttp.go

@@ -20,6 +20,8 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/noop"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/publicsuffix"
 
@@ -478,16 +480,18 @@ func (hss *ServerConfig) ToServer(_ context.Context, host component.Host, settin
 		next:            handler,
 		includeMetadata: hss.IncludeMetadata,
 	}
+	errorLog, err := zap.NewStdLogAt(settings.Logger, zapcore.ErrorLevel)
 
 	server := &http.Server{
 		Handler:           handler,
 		ReadTimeout:       hss.ReadTimeout,
 		ReadHeaderTimeout: hss.ReadHeaderTimeout,
 		WriteTimeout:      hss.WriteTimeout,
 		IdleTimeout:       hss.IdleTimeout,
+		ErrorLog:          errorLog,
 	}
 
-	return server, nil
+	return server, err
 }
 
 func responseHeadersHandler(handler http.Handler, headers map[string]configopaque.String) http.Handler {