Here is a sample chart created out of data exported by OpenCensus using Stackdriver exporter using Dropwizard tool.
https://github.com/census-instrumentation/opencensus-java/tree/master/contrib/dropwizard
private static void enableOpenCensusObservability() throws IOException {
DropwizardMetricRegistry registry = new DropwizardMetricRegistry();
BigtableClientMetrics.setMetricRegistry(registry);
Metrics.getExportComponent().getMetricProducerManager().add(
new DropWizardMetrics(Collections.singletonList(registry.getRegistry())));
// Register the Stackdriver exporter
StackdriverStatsExporter.createAndRegister();
}