register known issue for azure static roles metadata (#1187)

Register known issue for azure static roles released in 1.21.0

Author: cbiguet

content/vault/global/partials/important-changes/known-issue/azure-static-roles.mdx

@@ -0,0 +1,34 @@
+### Azure static roles fail to parse metadata as a map
+
+#### Affected versions
+
+- 1.21.0
+
+#### Issue
+
+The creation/update of an Azure static role fails if the request payload includes
+metadata provided as a map:
+
+```json
+{
+  "application_object_id": "408bf248-dd4e-4be5-919a-7f6207a307ab",
+  "ttl": "8760h",
+  "metadata": {
+    "team": "engineering",
+    "environment": "development"
+  }
+}
+```
+
+#### Workaround
+
+Provide the metadata field as a string when creating or updating an Azure
+static role:
+
+```json
+{
+  "application_object_id": "408bf248-dd4e-4be5-919a-7f6207a307ab",
+  "ttl": "8760h",
+  "metadata": "{\"team\": \"engineering\",\"environment\": \"development\"}"
+}
+```

content/vault/global/partials/important-changes/summary-tables/1_21.mdx

@@ -18,3 +18,4 @@ Introduced | Recommendations | Edition    | Change
 Found  | Fixed  | Workaround | Edition    | Issue
 ------ |--------| ---------- | ---------- | -----
 1.21.0 | No     | **Yes**    | Enterprise | [Missed events with multiple event clients](/vault/docs/v1.21.x/updates/important-changes#missed-events)
+1.21.0 | No     | **Yes**    | Enterprise | [Azure static roles fail to parse metadata as a map](/vault/docs/v1.21.x/updates/important-changes#azure-static-roles)

content/vault/v1.21.x/content/docs/updates/important-changes.mdx

@@ -81,3 +81,5 @@ filters you have two options:
 
 1. Spread them out among the nodes of the Vault cluster.
 1. Only subscribe to events on the active node of the cluster.
+
+@include '../../../global/partials/important-changes/known-issue/azure-static-roles.mdx'