{"source":"semconv","version":"1.44.0","attribute":{"id":"user_agent.original","type":"string","stability":"stable","brief":"Value of the [HTTP User-Agent](https://www.rfc-editor.org/rfc/rfc9110.html#field.user-agent) header sent by the client.","examples":["CERN-LineMode/2.15 libwww/2.17b3","Mozilla/5.0 (iPhone; CPU iPhone OS 14_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1","YourApp/1.0.0 grpc-java-okhttp/1.27.2"],"namespace":"user_agent","definedIn":"model/user-agent/registry.yaml","usedBy":[{"groupId":"entity.browser","groupType":"entity","signalName":"browser","requirementLevel":"recommended"},{"groupId":"span.azure.cosmosdb.client","groupType":"span","requirementLevel":"recommended"},{"groupId":"span.http.client","groupType":"span","requirementLevel":"opt_in"},{"groupId":"span.http.server","groupType":"span","requirementLevel":"recommended"}]},"history":[{"version":"1.30.0","publishedAt":"2025-01-24T19:11:42Z","kind":"first-seen","detail":"Already present at v1.30.0, the oldest release tracked here (stable)."}],"replaces":["http.user_agent"]}