Deep health checks
Difficulty 3 of 5
At 0:20 one third of orders started to fail. All three API servers still pass their health checks, and the balancer still sends each one a third of the traffic. Keep errors under 1 percent and p99 under 100 ms. You have 3 edits.
0:20. Order errors jump to 33 percent. The balancer shows 3 of 3 API servers healthy. Graph: errors by API server.
3 of 3 up · availability 99.9999%
Goals and limits
- Error rate
- under 1%
- p99 latency
- under 100 ms
- Monthly cost
- under 80 USD/mo
- Edit limit
- 3
- Traffic
- 1,800 req/s
Concepts
How players did
Player results load from the server.