Add back removed constants and make note about deprecation

Author: Sovietaced

CHANGELOG.md

@@ -13,9 +13,9 @@ 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)
 - Add client metric support to `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`. (#4707)
 
-### Removed 
+### Deprecated
 
-- Remove `RequestCount`, `RequestContentLength`, `ResponseContentLength`, `ServerLatency` constants from `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`. (#4707)
+- The `RequestCount`, `RequestContentLength`, `ResponseContentLength`, `ServerLatency` constants in `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` are deprecated. (#4707)
 
 ## [1.22.0/0.47.0/0.16.0/0.2.0] - 2024-01-18
 

instrumentation/net/http/otelhttp/common.go

@@ -31,6 +31,14 @@ 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