The spikes aren't single requests (at 1000 RPS, the spikes are well over a second long and you see hundreds of requests that spike). As for the reason, we suspe

The spikes aren't single requests (at 1000 RPS, the spikes are well over a second long and you see hundreds of requests that spike). As for the reason, we suspect that the different config reload mechanisms in the respective proxies is what triggers the spikes. (disclaimer: one of the authors)