Adds support for logs (specify level), metrics (enable metrics and Prometheus /metrics endpoint
and traces (jaeger or otlp) for standalone API server. This will allow any grafana core service
part of standalone apiserver to use logging, metrics and traces as normal.
* FrontendMetrics: Adds new backend api that frontend can use to push frontend measurements and counters to prometheus
* FrontendMetrics: Adds new backend api that frontend can use to push frontend measurements and counters to prometheus
* Fix naming
* change to histogram
* Fixed go lint
* Metrics: remove unused metrics
Metric `M_Grafana_Version` is not used anywhere, nor the mentioned
`M_Grafana_Build_Version`. Seems to be an artefact?
* Metrics: make the naming consistent
* Metrics: add comments to exported vars
* Metrics: use proper naming
Fixes#18110
