Query Federation: Combining Prometheus Servers
Query federation lets one Prometheus server scrape metrics from another, creating a meta-monitor. Use it to build a global view from local servers or to combine application and infrastructure metrics for richer alerts.
Query federation allows one Prometheus server to scrape selected time series from another, acting as a meta-monitor for scaling and enriching data. It's used hierarchically, with a global server pulling aggregated metrics from local servers, or cross-service, where an app monitor pulls resource metrics from a cluster monitor. This enables combined alerting. The common footgun is trying to federate all metrics instead of a selective, aggregated subset.
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