Note: We have also seen a drop in H2 count on Windows around the same time frame (without corresponding rises in SPDY/QUIC) so this might be related. This hasn't been seen on other platforms. Not sure what root cause is.

https://uma.googleplex.com/p/chrome/timeline_v2?q=%7B%22day_count%22%3A%2290%22%2C%22end_date%22%3A%22latest%22%2C%22window_size%22%3A%221%22%2C%22filters%22%3A%5B%7B%22fieldId%22%3A%22platform%22%2C%22operator%22%3A%22EQ%22%2C%22study%22%3A%22%22%2C%22selected%22%3A%5B%22W%22%5D%7D%2C%7B%22fieldId%22%3A%22channel%22%2C%22operator%22%3A%22EQ%22%2C%22study%22%3A%22%22%2C%22selected%22%3A%5B%224%22%5D%7D%5D%2C%22histograms%22%3A%5B%5B%22Net.HttpResponseInfo.ConnectionInfo%22%5D%5D%2C%22default_entry_values%22%3A%7B%22measureModel%22%3A%7B%22measure%22%3A%22%22%2C%22buckets%22%3A%5B%5D%2C%22percentiles%22%3A%5B%2250%22%5D%2C%22selectedFormulas%22%3A%5B%5D%2C%22allFormulas%22%3A%5B%5D%7D%2C%22zeroBased%22%3Atrue%2C%22logScale%22%3Afalse%2C%22showLowVolumeData%22%3Afalse%2C%22showVersionAnnotations%22%3Atrue%7D%2C%22entries%22%3A%5B%7B%22measureModel%22%3A%7B%22measure%22%3A%22bucket%22%2C%22buckets%22%3A%5B%223%22%2C%224%22%2C%225%22%5D%7D%7D%5D%7D

Net.HttpTimeToFirstByte also shows a similar shape being lower than average in April then spiking up again in May:
https://uma.googleplex.com/timeline_v2?q=%7B%22day_count%22%3A%2290%22%2C%22end_date%22%3A%22latest%22%2C%22window_size%22%3A3%2C%22filters%22%3A%5B%7B%22fieldId%22%3A%22platform%22%2C%22operator%22%3A%22EQ%22%2C%22study%22%3A%22%22%2C%22selected%22%3A%5B%22W%22%5D%7D%2C%7B%22fieldId%22%3A%22channel%22%2C%22operator%22%3A%22EQ%22%2C%22study%22%3A%22%22%2C%22selected%22%3A%5B%224%22%5D%7D%2C%7B%22fieldId%22%3A%22milestone%22%2C%22operator%22%3A%22GE%22%2C%22study%22%3A%22%22%2C%22selected%22%3A%5B%2248%22%5D%7D%5D%2C%22histograms%22%3A%5B%5B%22Net.HttpTimeToFirstByte%22%5D%5D%2C%22default_entry_values%22%3A%7B%22measureModel%22%3A%7B%22measure%22%3A%22%22%2C%22buckets%22%3A%5B%5D%2C%22percentiles%22%3A%5B%2250%22%5D%2C%22selectedFormulas%22%3A%5B%5D%2C%22allFormulas%22%3A%5B%5D%7D%2C%22zeroBased%22%3Atrue%2C%22logScale%22%3Afalse%2C%22showLowVolumeData%22%3Afalse%2C%22showVersionAnnotations%22%3Atrue%7D%2C%22entries%22%3A%5B%7B%22measureModel%22%3A%7B%22measure%22%3A%22percentile%22%7D%2C%22zeroBased%22%3Afalse%2C%22showLowVolumeData%22%3Atrue%7D%5D%7D

Worth noting that this has not gone back down.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot