Custom Metrics

[aorlowskiddm]

Hi all.

I reviewed the monitoring documentation page, specifically the section towards the bottom titled "User-Provided/Custom Reporter".

I am currently registering the JanusGraph metrics to a unified MetricRegistry in my code that contains all reportable metrics:

@PostConstruct
public void registerJanusgraphMetrics() {
    unifiedMetricRegistry.registerAll(MetricManager.INSTANCE.getRegistry());
}

However, it looks like there's a race condition. the @PostConstruct executes before JanusGraph's MetricManager.INSTANCE has any metrics yet (I verified this through debugger), so typically zero metrics are registered to the unified metric registry.

I can solve this by adding a timer that delays the registration for a fixed period of time, but am curious if there's a better way to approach this. Further, I'm unsure if registering the metrics in this way would somehow stop the correct reporting of metrics, given that my reporter is attached to the unifiedMetricRegistry and not directly to JanusGraph's MetricManager.INSTANCE.getRegistry().