Set deprecation date.

Author: marcalff

DEPRECATED.md

@@ -133,12 +133,7 @@ The following files:
 * `api/include/opentelemetry/trace/semantic_conventions.h`
 * `sdk/include/opentelemetry/sdk/resource/semantic_conventions.h`
 
-will be eventually removed.
+will be removed.
 
-No date is given now, this can happen at the earliest for release 1.19.0:
-
-* opentelemetry-cpp v1.17.0 only contain old header files
-* opentelemetry-cpp v1.18.0 will contain both old and new header files
-* opentelemetry-cpp v1.19.0 may only contain new header files (removing old)
-
-This allows a full release cycle for applications to adjust.
+The removal date is planned for July 1, 2025.
+This allows more than six months for applications to adjust.

api/include/opentelemetry/trace/semantic_conventions.h

@@ -4,9 +4,13 @@
  */
 
 /*
-  DO NOT EDIT, this is an Auto-generated file
-  from buildscripts/semantic-convention/templates/SemanticAttributes.h.j2
-*/
+ * This file is DEPRECATED, and no longer updated.
+ * See file DEPRECATED.md for details.
+ */
+
+#ifdef OPENTELEMETRY_NO_DEPRECATED_CODE
+#  error "header <trace/semantic_conventions.h> is deprecated."
+#endif
 
 #pragma once
 

sdk/include/opentelemetry/sdk/resource/semantic_conventions.h

@@ -4,9 +4,13 @@
  */
 
 /*
-  DO NOT EDIT, this is an Auto-generated file
-  from buildscripts/semantic-convention/templates/SemanticAttributes.h.j2
-*/
+ * This file is DEPRECATED, and no longer updated.
+ * See file DEPRECATED.md for details.
+ */
+
+#ifdef OPENTELEMETRY_NO_DEPRECATED_CODE
+#  error "header <resource/semantic_conventions.h> is deprecated."
+#endif
 
 #pragma once