Add Support For role: service

[si-c613]

Description

Prometheus supports Kubernetes service discovery for more roles than just Pod and Endpoint.
We have a use case for some applications which all report the same metric so we only want to scrape the Service rather than each Endpoint or Pod.

Acceptance Criteria

Add support for service: true to be set inside the kubernetes discovery config.

Helm values:

config:
  kubernetes:
    jobs:
      - job_name_prefix: default
        target_discovery:
          service: true # <---- new config value
          filter:
            annotations:
              prometheus.io/scrape-service: true

Prometheus config:

  kubernetes_sd_configs:
  - role: service
    kubeconfig_file: ""
    follow_redirects: true
    enable_http2: true

Describe Alternatives

Configure static_targets

Dependencies

documentation will need updating

Additional context

NA

Estimates

S = 1-3 days

For Maintainers Only or Hero Triaging this bug

Suggested Priority (P1,P2,P3,P4,P5):
Suggested T-Shirt size (S, M, L, XL, Unknown):

[workato-integration]

https://new-relic.atlassian.net/browse/NR-239691