Intermediate interview questions in Monitoring & SRE, page 4
Managing a risky release with feature flags
Deploy code dark behind an off flag, enable for internal then small percentage, monitor metrics, ramp gradually, then remove the flag.
Designing a feature flagging service
Control plane (UI, store, targeting), SDKs that cache flags locally for zero-latency evaluation, streaming/CDN delivery for near-real-time updates, and stale-flag lifecycle tooling.
Capacity planning for distributed stateful systems
Account for replication and cross-region network, IOPS and disk throughput, connection limits, partition/shard balance, and N+1 region failover headroom; validate with load and chaos…
Capacity planning for a distributed cache
Track hit ratio, memory and eviction rate, throughput/latency, and connections; correlate with growth to forecast when to add capacity before the hit ratio or evictions…
Federating reliability ownership to product teams
Build a self-service reliability platform (golden paths, paved roads), train teams and embed SLO/on-call practices, and govern with standards plus error budget…
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