write hostname in jmx exporter

[aadarsh verma]

I am running the exporter from every pod inside k8s
I want to differentiate the data by pod so I want the exporter to ship hostname parameter that prints the pod name 

how can i do this without modifying the source code if possible 

[Ben Kochie]

This is not possible. Target labels are assigned by Prometheus. This is part of "relabelings" in your ServiceMonitor spec.

Also, you already get this via the `pod` label.

https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/api.md#monitoring.coreos.com/v1.RelabelConfig

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