The Dell ECS Billing add-on monitors storage capacity and object usage across multiple Dell ECS namespaces and their S3 buckets. It retrieves billing data securely from the ECS Management REST API using an authenticated HTTPS session. Separate services provide namespace-level summaries and detailed metrics for every bucket. The add-on reports used storage, object counts, deleted objects, multipart uploads, timestamps, and bucket tags. Configurable warning and critical thresholds are available for storage usage and object counts. Connection, API, and data validation errors are reported individually for each affected namespace. The add-on supports Checkmk 2.3 through 2.5.