Add description and tier

doc/development/usage_ping/dictionary.md

@@ -16778,15 +16778,15 @@ Tiers: `free`
 
 ### `usage_activity_by_stage.manage.value_stream_management_customized_group_stages`
 
-Missing description
+Number of custom value stream analytics stages.
 
 [YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/config/metrics/counts_all/20210216180803_value_stream_management_customized_group_stages.yml)
 
-Group: `group::manage`
+Group: `group::optimize`
 
 Status: `data_available`
 
-Tiers:
+Tiers: `premium`, `ultimate`
 
 ### `usage_activity_by_stage.monitor.clusters`
 

ee/config/metrics/counts_all/20210216180803_value_stream_management_customized_group_stages.yml

 ---
 key_path: usage_activity_by_stage.manage.value_stream_management_customized_group_stages
-description:
+description: Number of custom value stream analytics stages.
 product_section: dev
-product_stage:
-product_group: group::manage
-product_category:
+product_stage: manage
+product_group: group::optimize
+product_category: value_stream_management
 value_type: number
 status: data_available
 time_frame: all
-data_source:
+data_source: database
 distribution:
 - ee
-tier: []
-skip_validation: true
+tier:
+- premium
+- ultimate