Prometheus focuses on being a metrics-based monitoring system with a simple architecture and explicit alerting rules.

It explicitly does not aim to solve:

• Logging or tracing (Prometheus only handles numeric metrics, also known as time series),
• Machine-learning- or AI-based anomaly detection,
• Horizontally scalable, clustered storage.

These can be valuable features, but Prometheus leaves these for other systems to solve that you would run alongside Prometheus.