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One strong interview answer to a Prometheus or Datadog-style platform: 5 million points a second pushed through a gateway into Kafka, series stored as compressed chunks at about 1.5 bytes a point, a label index and tiered rollups, the cardinality trap, and an alerting path of its own with for clauses, grouping and an external watchdog.
Every service you've ever designed ends with: and we'd monitor it.