Remove the deprecated const from otelhttp (#4894)

* Remove the deprecated const from otelhttp

* Add changelog entry

CHANGELOG.md

@@ -12,6 +12,13 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 - Add the new `go.opentelemetry.io/contrib/instrgen` package to provide auto-generated source code instrumentation. (#3068, #3108)
 
+### Removed
+
+- The deprecated `RequestCount` constant in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` is removed. (#4894)
+- The deprecated `RequestContentLength` constant in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` is removed. (#4894)
+- The deprecated `ResponseContentLength` constant in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` is removed. (#4894)
+- The deprecated `ServerLatency` constant in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` is removed. (#4894)
+
 ## [1.23.0/0.48.0/0.17.0/0.3.0] - 2024-02-06
 
 ### Added

instrumentation/net/http/otelhttp/common.go

@@ -31,14 +31,6 @@ const (
 
 // Server HTTP metrics.
 const (
-	// Deprecated: This field is unused.
-	RequestCount = "http.server.request_count" // Incoming request count total
-	// Deprecated: Use of this field has been migrated to serverRequestSize. It will be removed in a future version.
-	RequestContentLength = "http.server.request_content_length" // Incoming request bytes total
-	// Deprecated: Use of this field has been migrated to serverResponseSize. It will be removed in a future version.
-	ResponseContentLength = "http.server.response_content_length" // Incoming response bytes total
-	// Deprecated: Use of this field has been migrated to serverDuration. It will be removed in a future version.
-	ServerLatency      = "http.server.duration"      // Incoming end to end duration, milliseconds
 	serverRequestSize  = "http.server.request.size"  // Incoming request bytes total
 	serverResponseSize = "http.server.response.size" // Incoming response bytes total
 	serverDuration     = "http.server.duration"      // Incoming end to end duration, milliseconds