Default metrics port is in ip_local_port_range

[squeed]

The default metrics port of 60000 is in the ip_local_port_range, which means it can collide with TCP connections:

[root@test1-master-0 core]# sysctl net.ipv4.ip_local_port_range
net.ipv4.ip_local_port_range = 32768    60999

It is best practice not to listen in that range, as you can collide with existing tcp outgoing connections.

[lilic]

@squeed thanks for this, I am in the middle of redoing the metrics story, will keep this in mind by choosing a default port outside of this range, but also add the ability to override that.

[lilic]

Fixed in #786