This API is used to delete specified ECS metadata.
An ECS must be in active, stopped, paused, or suspended state, which is specified by OS-EXT-STS:vm_state.
DELETE /v2.1/{project_id}/servers/{server_id}/metadata/{key}
DELETE /v2/{project_id}/servers/{server_id}/metadata/{key}
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DELETE https://{endpoint}/v2/{project_id}/servers/{server_id}/metadata/{key} DELETE https://{endpoint}/v2.1/{project_id}/servers/{server_id}/metadata/{key}
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