You already need to deal with 3 things as opposed to one and learn PromQL to boot. If you want to have dashboards you also need to learn and use Grafana. I used both Prometheus+Thanos+Grafana stack and Zabbix in production and can say with certainty that the latter is much easier to use and set up for infra monitoring than the former. You need a whole dedicated observability team to use Prometheus effeciently.