@Override
    public void restoreThreadContext(CoroutineContext coroutineContext, SafeCloseable oldState) {
        oldState.close();
    }
Propagates {@link ServiceRequestContext} over Kotlin coroutines only when using
<a href="https://github.com/grpc/grpc-kotlin">gRPC-Kotlin</a>.
grpc/src/main/java/com/linecorp/armeria/server/grpc/ArmeriaRequestCoroutineContext.java