Observability & SRE

Metrics, traces, percentiles and what the graphs actually say.

62 posts

TCP Listen Backlog Lab: somaxconn, ListenOverflows, and Silent Drops

Hands-on TCP backlog lab: backlog=1 + slow accept → 34/200 OK, ListenOverflows +357; backlog=128 stays 200/200. Real ss + netstat numbers.

Hands-on UDS vs TCP loopback echo: connect-per ~3× RPS (49k vs 16k); reuse ~1.3×. Real Python numbers, no Docker.