Description

Create end-to-end tests in Kuadrant/testsuite to verify that token usage metrics are exposed via Limitador, with labels provided by the TelemetryPolicy. These tests confirm that metrics are emitted, accumulate as requests are made, and are separated by user/group labels.

Test Cases

Tests based on: #1460 / https://issues.redhat.com/browse/CONNLINK-484

• Metric existence and accumulation
  Send requests as the same user/group on the same route/gateway.
  → Expect: authorized_hits metric is present with the expected labels (user, group)
  → Expect: authorized_hits metric increases with requests and remains within the range of total tokens consumed (token values will vary slightly due to timing of Prometheus scrapes, hence why exact matching is not asserted)

Example of authorized_hits metric output:
authorized_hits{group="free",user="freeuser2",limitador_namespace="llm/llm-sim"} 100

• Separation by user/group
  Send requests as both free and paid users/groups.
  → Expect:authorized_hits, authorized_calls and limited_calls metrics are reported separately for each user/group label

Note: The above are subject to change as development progresses.