docs/perf: record the passing 4h soak (run r4)#207
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r4 sustains 100 eps for 4h through Kafka→Flink→bridge→ClickHouse with produced == delivered == applied == 1,440,000, zero duplicates, zero failures, lag_end 0, and no Flink restarts (484/484 checkpoints). Closes the multi-hour soak gate that r1 (disk) and r3 (harness) left open; both prior failures and the fixes they motivated are summarised in the doc. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Run r4 sustains 100 eps for 4 hours through the real Kafka→Flink→bridge→ClickHouse path:
Gate (produce≥95 / apply≥90 / flink≥90 / failures=0 / duplicates<5000 / lag_end≤100): PASS on all six.
Closes the multi-hour soak gate that r1 (stand disk exhaustion) and r3 (harness lost produce after a broker self-fence) left open — both prior failures and the fixes they motivated (log rotation, broker session timeout, bench delivery guard) are summarised in the doc alongside r1/r3.
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