Metrics where updated to the new makeMetrics interface with 844494 for T320748: Get Kartotherian SLO metrics into Prometheus.
- Refer to the service-runner migration guide and a similar migration patch in T271711.
- All calls to metrics in Kartotherian should be updated to use the newer makeMetrics interface
Only remaining part is updating the howto.
- Update the howto in coding.md to point to the makeMetrics documentation. Probably best to remove specific docs in the coding.md file, to better track upstream.