Currently I use too many different monitoring technologies, so I decided to optimize the whole thing. The technologies currently used are Sensu, Prometheus, Alertmanager and Uptime Kuma.
In the future I want to use only Prometheus with the Alertmanager for the host and application monitoring and for checks from external and the associated status page still Uptime Kuma.
So today I shut down my Sensu instance and migrated my Uptime Kuma to the Sensu host. Through the migration my Uptime Kuma is now also finally IPv6 capable.