Draft: Add monitoring for new CustomersDot SLIs

Etienne Baquérequested to merge
new-cdot-slis into master

Related to https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/15147

The goal of this MR is to add new SLIs related to usage billing in CustomersDot (introduced here, implemented here): gitlab_sli_customers_dot_usage_billing_successes and gitlab_sli_customers_dot_usage_billing_errors.

gitlab_sli_customers_dot_usage_billing_successes{checkpoint="enrichment"} 0.0
gitlab_sli_customers_dot_usage_billing_successes{checkpoint="consumption"} 0.0
gitlab_sli_customers_dot_usage_billing_errors{checkpoint="enrichment"} 0.0
gitlab_sli_customers_dot_usage_billing_errors{checkpoint="consumption"} 0.0

Respectively, these counters track the number of times an event was enriched/consumed successfully or not.

Edited by Etienne Baqué

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