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> Prometheus is about dimensional numeric time series metrics only (no log-based analysis, no per-request tracing, etc.).

Any thoughts on a companion (open source) system that focuses more on logs and such?

For logs you're looking at the ELK stack, for tracing Zipkin.

For tracing check out sysdig's new 'tracers' functionality. Tracing for Microservices, transactions, all the way down to system calls. www.sysdig.org

All that and the only cost is a third-party kernel module :)