[Monitoring] Correct counter representation in Grafana

[alvarolop]

The Grafana dashboard represents the count of executions to the /hello endpoint of the API, but the value in the X axis is not correct. (It tries to calculate the mean count per second during a minute, so 10 calls shows less than 1.0 for a minute).

Dashboard screenshot: https://github.com/alvarolop/quarkus-observability-app/blob/main/docs/images/grafana-dashboard.png

This is the wrong query: https://github.com/alvarolop/quarkus-observability-app/blob/main/openshift/ocp-monitoring/grafana/dashboard.json#L246-L263

I would like to see all the executions in each minute (So, current-previousMinute)