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kotlinlang

Hi <@UDVMV4NBU>
We have tried to upgrade our service to Micronaut 2.0 and found a strange bug with metrics.
we are using kotlin coroutine dispatcher for custom thread pool. Metrics were not being updated with right status code when an exception is thrown after the upgrade.
I have created a sample project (<https://gitlab.com/anilkd/micronaut-kotlin-sample>) to demonstrate the issue.
Sample projects contain 3 endpoints

1. /products/executor{?productId}
returns expected status, message when an exception is thrown and metric `http.server.requests` is updated with right status code
2. /products/scope{?productId}
returns expected status, message when an exception is thrown and metric `http.server.requests` is updated with right status code
3. /products/dispatcher{?productId}
returns expected status, message when an exception is thrown but metric `http.server.requests` is updated with status code 200 rather than 400, This was working fine in previous version of Micronaut 1.3.6