I think the issue for me is that "pull" requires me to open up lots of services/hosts/sidecars to allow inwards connections. Thats a lot more things to monitor

I think the issue for me is that "pull" requires me to open up lots of services/hosts/sidecars to allow inwards connections. Thats a lot more things to monitor and test to see if its broken. having a single dns record that I can route based on location/traffic/load/uptime autonomously is, I think, super convenient. For example, if I want to have a single metrics config for a global service I can say: "server: metrics-host" and depending on the dns search path it'll either get the test, regional or global metrics server. (ie .local, .us-east-1 or *.company.tld) However for most people its a single DNS record with a load balancer. When a host stops pushing metrics, you check the host aliveness score and alert.