35fcbae8c6
Prior to this commit, regressions were introduced with gh-31417: 1. the observation keyvalues would be inconsistent with the HTTP response 2. the observation scope would not cover all controller handlers, causing traceIds to be missing The first issue is caused by the fact that in case of error signals, the observation was stopped before the response was fully committed, which means further processing could happen and update the response status. This commit delays the stop event until the response is committed in case of errors. The second problem is caused by the change from a `contextWrite` operator to using the `tap` operator with a `SignalListener`. The observation was started in the `doOnSubscription` callback, which is too late in some cases. If the WebFlux controller handler is synchronous non-blocking, the execution of the handler is performed before the subscription happens. This means that for those handlers, the observation was not started, even if the current observation was present in the reactor context. This commit changes the `doOnSubscription` to `doFirst` to ensure that the observation is started at the right time. Fixes gh-31703 Fixes gh-31706
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