In the past few days, the VR Telemetry tests have started randomly dropping the results from stories. See the tail end of the graph here for an example https://chromeperf.appspot.com/report?sid=9e6a965aad6f99209333625ce2b55db4124f8ed279938c85c4345c31416ea2c4.

This is reproducible both locally and on the bot in our lab that runs the automated test. I haven't confirmed yet that this is VR-only, but I don't believe there have been any recent VR metric changes that would be causing this.

What happens is that all 10 stories complete successfully (they can be observed running on the device and the benchmark runner reports them as running successfully), but the majority of results get dropped. This is visible in both the above graph and the local results.html page, which only has links to a random subset of traces instead of all 10.