Flipkart ditched its creaky StatsD + InfluxDB stack for a federated Prometheus setup—built to handle 80M+ time-series metrics without choking. The move leaned into pull-based collection, PromQL's firepower, and hierarchical federation for smarter aggregation and long-haul queries.
Why it matters: Prometheus federation makes multi-tenant observability not just possible, but scalable—even with high cardinality and messy sprawl.
