Total consumer lag is climbing but only one partition is behind, and adding consumers changed nothing. Why?

One partition has one consumer, by design. If the key distribution sends a third of the traffic to one partition, the parallelism you bought is unavailable to the work that needs it.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

One partition has one consumer, by design. If the key distribution sends a third of the traffic to one partition, the parallelism you bought is unavailable to the work that needs it.

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