wu-sheng commented on issue #2599: How to identify a span failure？ URL: https://github.com/apache/skywalking/issues/2599#issuecomment-489511321 Error is an API for agent. `ActiveSpan#tag` doesn't support to do that. If you want that, try to contribute 1. Add `ActiveSpan#error`in toolkit 1. Call `AbstractSpan#errorOccurred` in the toolkit activation.
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