SRE practices: SLOs, incidents, redundancy

Final test: SRE practices: SLOs, incidents, redundancy

Question 11 of 15

Read the output

What happened to this request?

$ tail -n 1 /var/log/nginx/lb-access.log
::1 [22/Oct/2026:13:11:39 +0000] "GET / HTTP/1.1" 200 upstream=127.0.0.1:8082, 127.0.0.1:8081 ustatus=502, 200 urt=0.000, 0.021 rt=0.021

The client got 502, and nginx logged the 200 for itself.
8082 refused the connection, nginx retried the request on 8081, and the client got 200.
8082 answered 502, and the client repeated the request itself.
The request went to both copies at once, and nginx picked the good answer.

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