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Aggregating metrics is significantly more expensive than electing a leader. |
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I was going through the de-duplication docs for Grafana Mimir https://grafana.com/docs/mimir/latest/configure/configure-high-availability-deduplication/
And then we have de-duplication in Thanos.
The difference which I saw is Grafana Mimir elects a leader Prometheus and offloads metrics from that instance, rejecting metrics from the other instance. While Thanos aggregates the metrics from both instances of Prometheus.
Why was this architecture followed? Aggregating metrics from both instances seems like a good way.
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