Update semantic_conventions/http-common.yaml

Co-authored-by: Christian Neumüller <[email protected]>

semantic_conventions/http-common.yaml

@@ -46,8 +46,8 @@ groups:
           By default, this convention defines "known" methods as the ones listed in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
           and the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
 
-          If the HTTP request method is not known to instrumentation, it MUST set the `http.request.method` attribute to `_OTHER` and, if it reports spans, MUST
-          populate the exact method passed in the request line on `http.request.method_original` span attribute.
+          If the HTTP request method is not known to instrumentation, it MUST set the `http.request.method` attribute to `_OTHER` and, except if reporting a metric, MUST
+          set the exact method received in the request line as value of the `http.request.method_original` attribute.
 
           If the HTTP instrumentation could end up converting valid HTTP request methods to `_OTHER`, then it MUST provide a way to override
           the list of known HTTP methods. If this override is done via environment variable, then the environment variable MUST be named