public HealthCheckServiceBuilder updateListener(HealthCheckUpdateListener updateListener) {
        updateListenersBuilder.add(requireNonNull(updateListener, "updateListener"));
        return this;
    }
Adds a {@link HealthCheckUpdateListener} which is invoked when the healthiness of the {@link Server} is
updated.

@see #updatable(boolean)
@see #updatable(HealthCheckUpdateHandler)
core/src/main/java/com/linecorp/armeria/server/healthcheck/HealthCheckServiceBuilder.java