Add missing issue in the changelog

.chloggen/olivierg_gateway-usage-gauge.yaml

@@ -8,7 +8,7 @@ component: pkg/otlp/attributes
 note: Add a new parameter which has a method called when the hostname is resolved
 
 # The PR related to this change
-issues: []
+issues: [479]
 
 # (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.