Using Icinga 2 and like to get your existing performance data into Prometheus? Then try out our new icinga2-exporter. It integrates with Icinga 2 over the Icinga 2 API and supports labeling based on host custom variables. You can use the exporter together with monitor-promdiscovery to have dynamic discovery for the hosts in Icinga 2 that should be scraped.
This is the first release so please send feedback or create issues on the Github site.