@Trace to any method you want to trace. After that, you can see the span in the Stack.@Tag will try to tag the current active span with the given key (Tag#key()) and (Tag#value()), if there is no active span at all, this annotation takes no effect. @Tag can be repeated, and can be used in companion with @Trace, see examples below. The value of Tag is the same as what are supported in Customize Enhance Trace./** * The codes below will generate a span, * and two types of tags, one type tag: keys are `tag1` and `tag2`, values are the passed-in parameters, respectively, the other type tag: keys are `username` and `age`, values are the return value in User, respectively */ @Trace @Tag(key = "tag1", value = "arg[0]") @Tag(key = "tag2", value = "arg[1]") @Tag(key = "username", value = "returnedObj.username") @Tag(key = "age", value = "returnedObj.age") public User methodYouWantToTrace(String param1, String param2) { // ... }
Sample codes only