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There is one reserved word for property keys and values: tags, either as tags or TAGS. Tags themselves have no reserved words.
The online metadata is migrated when CDAP is upgraded from 4.3.x to 5.0.0. During metadata migration, writes to non-migrated entities fail and reads on metadata for non-migrated entities do not have all the metadata. Metadata migration takes approximately 2-3 minutes. You can check the metadata migration status by using the :ref:upgrade status <http-restful-api-monitor-status-system-upgrade> REST endpoint.
All methods or endpoints described in this API have a base URL (typically http://<host>:11015 or https://<host>:10443) that precedes the resource identifier, as described in the Microservices Conventions. These methods return a status code, as listed in the Microservices Status Codes.
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