Apisonator prometheus metrics bugs

Originally reported by ficap_devel in https://issues.redhat.com/browse/THREESCALE-6446

I created this new issue to split the backend and system bugs.

stats requests per second + heatmap

Sending request to the backend listener internal api endpoint “internal/services/stats” does not produce a response in the grafana stats graph. Instead, the requests seems to be counted as services requests.

curl -H "Authorization: Basic_

_" -k -v  -X GET "https://backend-3scale.th

r-met.apps.example-cluster.com/internal/services/4/stats"

usage limits requests per second + heatmap

Sending request to the backend listener internal api endpoint “internal/services/{service_id}/plans/{plan_id}/usagelimits” does not produce a response in the grafana Usage Limits graph. Instead, the requests seems to be counted as services requests.

curl -H "Authorization: Basic {Base64Encoded Username and Password}" -k -v  -X GET "https://backend-3scale.th

r-met.apps.example-cluster.com/internal/services/4/plans/36/usagelimits

utilization requests per second + heatmap

Sending request to the backend listener internal api endpoint “internal/services/{service_id}/applications/{app_id}/utilization” does not produce a response in the grafana Utilization graph. It is counted as application requests.

curl -H "Authorization: Basic {Base64Encoded Username and Password}" -k -v  -X GET "https://backend-3scale.th

r-met.apps.example-cluster.redhat.com/internal/services/4/applications/12/utilization"