Just in time for FOSDEM, I put my latest fun systems debugging story up. This one is about a mysterious performance problem in a relay server for a popular VPN service:
https://bowshock.nl/stories/high_load_network_relay/
While have plenty of work with my ngnfs contract, I always enjoy new challenges. If you have a systems problem you need solved, I offer free consultations:
https://bowshock.nl/#free-consultation
Do you have any fun debugging stories? Reply and I will boost. And come say hi if you're at FOSDEM!