anchor.diff:  ceph_model() ->
       #{
           %% The ID of storage.
  -        id => {string, optional},
  +        id => { string, optional },
           %% The name of storage.
  -        name => {string, optional},
  +        name => { string, optional },
           %% Defines whether storage administrator credentials (username and key)
           %% may be used by users without storage accounts to access storage in
           %% direct IO mode.
  -        insecure => {boolean, optional},
  +        insecure => { boolean, optional },
           %% Defines whether storage is readonly.
  -        readonly => {boolean, optional},
  +        readonly => { boolean, optional },
           %% The type of storage.
           type => {equal, <<"ceph">>},
           %% If true LUMA and reverse LUMA services will be enabled.
  -        lumaEnabled => {boolean, optional},
  +        lumaEnabled => { boolean, optional },
           %% URL of external LUMA service
  -        lumaUrl => {string, optional},
  +        lumaUrl => { string, optional },
           %% LUMA cache timeout in minutes.
  -        lumaCacheTimeout => {integer, optional},
  +        lumaCacheTimeout => { integer, optional },
           %% LUMA API Key, must be identical with API Key in external LUMA
           %% service.
  -        lumaApiKey => {string, optional},
  +        lumaApiKey => { string, optional },
           %% The username of the Ceph cluster administrator.
           username => string,
           %% The admin key to access the Ceph cluster.
  
positive.code:         %% If true, files popularity feature for the space is enabled
          enabled => boolean,
          %% REST endpoint to view file popularity statistics
          restUrl => {string, optional}
      }.
  
  %%--------------------------------------------------------------------
  
negative.code: time_stats_collection_model() ->
      #{
          %% Statistics of storage sync jobs queue length.
          queueLength => { time_stats_model(), optional },
          %% Statistics of storage sync imported files.
          insertCount => { time_stats_model(), optional },
          %% Statistics of storage sync updated files.
          updateCount => { time_stats_model(), optional },
          %% Statistics of storage sync deleted files.
          deleteCount => { time_stats_model(), optional }
      }.
  
  %%--------------------------------------------------------------------
  