Adding separate whitelist for ROSA HCP OBO derived remote-write billing metrics that are specific to ROSA/HCP. (#916)

Context: https://redhat-internal.slack.com/archives/C010A637DGB/p1746440313578859

Signed-off-by: Moad Zardab <[email protected]>

Author: moadz

configuration/telemeter-rosa/README.md

@@ -0,0 +1,4 @@
+# ROSA HCP Billing Metrics
+There are a set of ROSA metrics that are federated from OBO into `telemeter-staging`, `telemeter-int` and `telemeter-prod`. These metrics are used for Subwatch billing of ROSA clusters via telemetry.   
+
+The remote-write config can be found [here](https://gitlab.cee.redhat.com/service/osd-fleet-manager/-/blob/main/config/resources/managed-cluster-monitoring-stack.yaml). *Do not modify* without express approval from the ROSA team in the #sd-rosa-hcp channel.

configuration/telemeter-rosa/metrics.json

@@ -0,0 +1,3 @@
+[
+  "{__name__=\"hostedcluster:hypershift_cluster_vcpus:max\"}"
+]

resources/services/telemeter-template.yaml

@@ -296,6 +296,7 @@ objects:
           - --whitelist={__name__="workload:cpu_usage_cores:sum"}
           - --whitelist={__name__="workload:memory_usage_bytes:sum"}
           - --whitelist={__name__=~"cluster:usage:.*"}
+          - --whitelist={__name__="hostedcluster:hypershift_cluster_vcpus:max"}
           - --elide-label=prometheus_replica
           - --log-level=${TELEMETER_LOG_LEVEL}
           - --token-expire-seconds=${TELEMETER_SERVER_TOKEN_EXPIRE_SECONDS}
@@ -596,6 +597,7 @@ objects:
           - --whitelist={__name__="workload:cpu_usage_cores:sum"}
           - --whitelist={__name__="workload:memory_usage_bytes:sum"}
           - --whitelist={__name__=~"cluster:usage:.*"}
+          - --whitelist={__name__="hostedcluster:hypershift_cluster_vcpus:max"}
           - --elide-label=prometheus_replica
           - --log-level=${TELEMETER_LOG_LEVEL}
           - --token-expire-seconds=${TELEMETER_SERVER_TOKEN_EXPIRE_SECONDS}

services/telemeter-template.jsonnet

@@ -14,7 +14,7 @@ local telemeter = (import 'telemeter.libsonnet') {
       tokenExpireSeconds: '${TELEMETER_SERVER_TOKEN_EXPIRE_SECONDS}',
       telemeterForwardURL: '${TELEMETER_FORWARD_URL}',
 
-      whitelist+: (import '../configuration/telemeter/metrics.json'),
+      whitelist+: (import '../configuration/telemeter/metrics.json') + (import '../configuration/telemeter-rosa/metrics.json'),
       elideLabels+: ['prometheus_replica'],
       resourceLimits:: {
         cpu: '${TELEMETER_SERVER_CPU_LIMIT}',