Implement observability for new internal-api service
Create metrics and dashboards for the new API service `internal-api`, in order to have observability on this service and start collecting the data to make the final decision on rolling out this service into production environments. * [For metrics](https://gitlab.com/gitlab-com/runbooks/-/tree/master/metrics-catalog/services) * [For dashboards](https://gitlab.com/gitlab-com/runbooks/-/tree/master/dashboards)
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