Commit 1c69050d authored by Marius Bobin's avatar Marius Bobin

Discourage the usage of labels with high cardinality

parent a6a354d8
......@@ -75,5 +75,10 @@ This section describes how to add new metrics for self-monitoring
1. Select the appropriate name for your metric. Refer to the guidelines
for [Prometheus metric names](https://prometheus.io/docs/practices/naming/#metric-names).
1. Update the list of [GitLab Prometheus metrics](../administration/monitoring/prometheus/gitlab_metrics.md).
1. Carefully choose what labels you want to add to your metric. Values with high cardinality,
like `project_path`, or `project_id` are strongly discouraged because they can affect our services
availability due to the fact that each set of labels is exposed as a new entry in the `/metrics` endpoint.
For example, a histogram with 10 buckets and a label with 100 values would generate 1000
entries in the export endpoint.
1. Trigger the relevant page or code that records the new metric.
1. Check that the new metric appears at `/-/metrics`.
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