Prometheus instance label control

https://valyala.medium.com/how-to-use-relabeling-in-prometheus-and-victoriametrics-8b90fc22c4b2 https://www.robustperception.io/controlling-the-instance-label/

https://grafana.com/blog/2022/03/21/how-relabeling-in-prometheus-works/

https://prometheus.io/docs/concepts/jobs_instances/#:~:text=In%20Prometheus%20terms%2C%20an%20endpoint,example%2C%20is%20called%20a%20job.

https://medium.com/geekculture/single-prometheus-job-for-dozens-of-blackbox-exporters-2a7ba492d6c8

https://prometheus.io/blog/2015/06/01/advanced-service-discovery/