Change default port to some unique value

[pkoziol]

9090 is already used by Prometheus. According to the documentation exporters should use register unique port number on the wiki and use it.

[kbudde]

@pkoziol you are right. Using the same port as Prometheus was not a good decision.
I was thinking about a 1.0 release. It's perfect to be included.

[kbudde]

Added reservation: 9419
https://github.com/prometheus/prometheus/wiki/Default-port-allocations

[uttamanand]

Hi,

So rabbitmq_exporter just needs to be installed on the VM giving the rabbitmq_hostname:15672 ?
Don't we need to put the plugin ( *.ez file) in the plugin folder and enable it using enabled_plugin file?

Thanks
Uttam