In Percona Monitoring and Management 2.12.0 (PMM), we replaced Prometheus with VictoriaMetrics. Metrics data can now be ‘pushed’ to the server as well as being ‘pulled’ by the server. This is useful if you want to keep open ports to a minimum or your monitored system is in an environment that favors “inside>out” communication (like [&]

https://www.percona.com/blog/2021/01/29/percona-monitoring-and-management-2-14-moving-to-a-push-model-for-victoriametrics/