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Add prometheous endpoints for reporting metrics [RUN ALL RSPEC] [RUN AS-IF-FOSS]

Marius Bobin requested to merge add-ci-prometheus-monitoring-for-frontend into master

What does this MR do?

Adds an endpoint that can by used by frontend to observe Prometheus metrics. The available metrics for this operation are:

  • pipeline_graph_link_calculation_duration_seconds
  • pipeline_graph_links_total
  • pipeline_graph_link_per_job_ratio

Related to #281351 (closed)

curl \
  -X POST \
  -H "Content-Type: application/json" \
  http://gdev.bobin.ro:3000/root/fallback-cache/-/ci/prometheus_metrics/histograms.json \
    --data '{"histograms": [{"name": "pipeline_graph_link_calculation_duration_seconds", "value": "5"}]}'

For this curl command to work, an authenticity token is required in the request headers or skip_before_action :verify_authenticity_token should be added in the controller.

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Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team
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