Report metrics during shutdown of spring-boot app - spring-boot

Question

I have a shutdownhook which is successfully executed, but the metrics is not reported. Any advice is appreciated! I guess the issues can be
StatsDMetricWriter might be disposed before the shutdown hook? How can I verify? Or is there a way to ensure the ordering of the configured singletons?
The time gap between metric generation and app shutdown < configured delay. I tried spawning a new Thread with Thread.sleep(20000). But it didn't work
The code snippets are as follows:
public class ShutDownHook implements DisposableBean {
#Autowired
private MetricRegistry registry;
#Override
public void destroy() throws Exception {
registry.counter("appName.deployments.count").dec();
//Spawned new thread here with high sleep with no effect
}
}
My Metrics Configuration for dropwizard is as below:
#Bean
#ExportMetricReader
public MetricRegistryMetricReader metricsDWMetricReader() {
return new MetricRegistryMetricReader(metricRegistry);
}
#Bean
#ExportMetricWriter
public MetricWriter metricWriter() {
return new StatsdMetricWriter(app, host, port);
}
The reporting time delay is set as 1 sec:
spring.metrics.export.delay-millis=1000
EDIT:
The problem is as below:
DEBUG 10452 --- [pool-2-thread-1] o.s.b.a.m.statsd.StatsdMetricWriter : Failed to write metric. Exception: class java.util.concurrent.RejectedExecutionException, message: Task com.timgroup.statsd.NonBlockingUdpSender$2#1dd8867d rejected from java.util.concurrent.ThreadPoolExecutor -- looks like ThreadPoolExecutor is shutdown before the beans are shutdown.
Any Suggestions please?
EDIT
com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsPoller.getCommandJson() has the following piece of code
json.writeNumberField("reportingHosts", 1); // this will get summed across all instances in a cluster
I'm not sure how/why the numbers will add up? Where can I find that logic?