MilkSDF opened a new issue #4631: Question about the value of responseCode in the OAL URL: https://github.com/apache/skywalking/issues/4631 Please answer these questions before submitting your issue. - Why do you submit this issue? - [*] Question or discussion ___ ### Question - What do you want to know? I want to monitor the responseCode of the http call ,so I define a metric in the oal file service_responseCode = from(Service.responseCode).sum() I invoke a http request, but in the table of service_responseCode, the value is always 0. isn't it should be multiple 200 or 500 ？  how to write the expression to calculate the percent of the 500 responseCode in the http call. ___ ### Bug - Which version of SkyWalking, OS and JRE? - Which company or project? - What happen? If possible, provide a way for reproducing the error. e.g. demo application, component version. ___ ### Requirement or improvement - Please describe about your requirements or improvement suggestions.
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