Add milestone to licese metrics

  - Add milestone <13.9 for metrics where
  we don't know the milestone
  - Update regex for milestone validation

config/metrics/license/20210204124827_hostname.yml

@@ -7,6 +7,7 @@ product_group: group::product intelligence
 product_category: collection
 value_type: string
 status: data_available
+milestone: "<13.9"
 time_frame: none
 data_source: system
 data_category: standard

config/metrics/license/20210204124928_version.yml

@@ -8,6 +8,7 @@ product_group: group::product intelligence
 product_category: collection
 value_type: string
 status: data_available
+milestone: "<13.9"
 time_frame: none
 data_source: system
 distribution:

config/metrics/license/20210204124936_pages_version.yml

@@ -8,6 +8,7 @@ product_group: group::release
 product_category: pages
 value_type: string
 status: data_available
+milestone: "<13.9"
 time_frame: none
 data_source: system
 distribution:

config/metrics/license/20210204124938_recording_ce_finished_at.yml

@@ -8,6 +8,8 @@ product_group: group::product intelligence
 product_category: collection
 value_type: string
 status: data_available
+milestone: "13.0"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/31222
 time_frame: none
 data_source: system
 distribution:

config/metrics/license/20210216175601_version.yml

@@ -8,6 +8,7 @@ product_group: group::distribution
 product_category: collection
 value_type: string
 status: data_available
+milestone: "<13.9"
 time_frame: none
 data_source: system
 distribution:

config/metrics/license/20210216175602_installation_type.yml

@@ -8,6 +8,8 @@ product_group: group::distribution
 product_category: collection
 value_type: string
 status: data_available
+milestone: "11.0"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/5952/
 time_frame: none
 data_source: system
 distribution:

config/metrics/license/20210216181053_version.yml

@@ -8,6 +8,7 @@ product_group: group::package
 product_category: container registry
 value_type: number
 status: data_available
+milestone: "<13.9"
 time_frame: none
 data_source: system
 distribution:

config/metrics/license/20210216183237_version.yml

@@ -8,6 +8,7 @@ product_group: group::distribution
 product_category: ''
 value_type: string
 status: data_available
+milestone: "<13.9"
 time_frame: none
 data_source: system
 distribution:

config/metrics/schema.json

@@ -34,7 +34,7 @@
     },
     "milestone": {
       "type": ["string", "null"],
-      "pattern": "^[0-9]+\\.[0-9]+$"
+      "pattern": "^<?[0-9]+\\.[0-9]+$"
     },
     "milestone_removed": {
       "type": ["string", "null"],

ee/config/metrics/license/20210204124940_recording_ee_finished_at.yml

@@ -7,6 +7,8 @@ product_group: group::product intelligence
 product_category: collection
 value_type: string
 status: data_available
+milestone: "13.0"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/31222
 time_frame: none
 data_source: system
 data_category: standard