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-rw-r--r--doc/administration/monitoring/prometheus/gitlab_metrics.md6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/administration/monitoring/prometheus/gitlab_metrics.md b/doc/administration/monitoring/prometheus/gitlab_metrics.md
index cf17e599e04..f0d6a77f528 100644
--- a/doc/administration/monitoring/prometheus/gitlab_metrics.md
+++ b/doc/administration/monitoring/prometheus/gitlab_metrics.md
@@ -55,6 +55,12 @@ The following metrics are available:
| filesystem_circuitbreaker | Gauge | 9.5 | Whether or not the circuit for a certain shard is broken or not |
| circuitbreaker_storage_check_duration_seconds | Histogram | 10.3 | Time a single storage probe took |
+NOTE: Histogram metrics are composed of 3 pieces.
+
+* <name>_bucket - The histogram buckets. (`le` label for each bucket)
+* <name>_sum - The total of observations.
+* <name>_count - The total count of observations.
+
## Metrics shared directory
GitLab's Prometheus client requires a directory to store metrics data shared between multi-process services.