What would you monitor for Consumer Groups and Rebalance on-call?

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Quick interview answer

On-call for Consumer Groups and Rebalance: alert on lag/latency, error spikes, and saturation — with runbooks. Baseline: Each partition consumed by one consumer in group. Rebalance on member join/leave — can cause duplicate processing if offsets not committed carefully.

Detailed answer

On-call monitoring for Consumer Groups and Rebalance: • Golden signals: latency, traffic, errors, saturation • Consumer Groups and Rebalance-specific gauges (queue delay, pool wait, cache miss, etc.) • Alerting: burn-rate / multi-window so pages are actionable • Runbook: mitigate → diagnose → escalate Parent context: Baseline: Each partition consumed by one consumer in group. Rebalance on member join/leave — can cause duplicate processing if offsets not committed carefully.

Full explanation

Tie each alert to a user-visible or SLO impact for Consumer Groups and Rebalance. Baseline: Each partition consumed by one consumer in group. Rebalance on member join/leave — can cause duplicate processing if offsets not committed carefully.

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Parent context — Consumer Groups and Rebalance

Baseline: Each partition consumed by one consumer in group. Rebalance on member join/leave — can cause duplicate processing if offsets not committed carefully.

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