[hagen1778]

> Would it be possible to do this in Postgres as well?

Of course! The question is only in your requirements. Keeping a simple counter with limited cardinality should work just great. But nowadays monitoring is much more serious than that. For monitoring k8s clusters the average ingestion rate of metrics per second varies from 100K to 2Mil. I don't know if, resource-wise, it would be a right decision to use Postgres for storing this.

So when requirements are high, and they are for real-time infrastructure and applications monitoring, it is better to consider something like ClickHouse (for people familiar with Postgres) or VictoriaMetrics (for people familiar with Prometheus).