Checkmk Werk 12274: API: removing etag requirement in delete endpoints

ID: 12274 Title: API: removing etag requirement in delete endpoints Component: Core & setup Level: 1 Class: New feature Version: 2.1.0i1 The delete endpoint for host_config, service_group, host_group and contact_group required an etag to perform the action. This requirement is removed to be consistent with the other delete endpoints.