Update to Prometheus 1.x client

[onobc]

We are currently using the 0.x Prometheus client (simple client). We want to move up to the 1.x client as Boot will remove the support for simple client auto-configuration in SB 3.5.x

Note

The update to 1.x client changes output of metrics and is likely to break our dashboard.
Pay attention to: https://github.com/micrometer-metrics/micrometer/wiki/1.13-Migration-Guide