SRE practices: SLOs, incidents, redundancy

Quiz: redundancy

Question 6 of 9

Read the output

Which timeout ran out?

$ sudo tail -n 1 /var/log/nginx/error.log
2026/10/22 13:21:59 [error] 2263#2263: *82 upstream timed out (110: Connection timed out) while reading response header from upstream, client: ::1, server: _, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8083/", host: "localhost"

fail_timeout — copy 8083 is taken out.
proxy_read_timeout — 8083 did not send its answer in time.
curl's timeout on the client side.
proxy_connect_timeout — nginx could not connect to 8083.

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