anchor.diff:          deployed => boolean,
           %% Indicates that this is Oneprovider's panel.
           serviceType => {equal, <<"oneprovider">>},
  -        %% This cluster's Oneprovider Id. Null if the Oneprovider is not
  -        %% registered or Oneprovider worker is down.
  +        %% This cluster's Oneprovider Id. `null` if the
  +        %% Oneprovider is not registered or Oneprovider worker is down.
           providerId => string,
  -        %% The domain of the Onezone where this Oneprovider is registered. Null
  -        %% if the Oneprovider is not registered.
  +        %% The domain of the Onezone where this Oneprovider is registered.
  +        %% `null` if the Oneprovider is not registered.
           zoneDomain => string,
           %% True if the Oneprovider has been registered at a Onezone.
           isRegistered => {boolean, optional}
  
positive.code:         deployed => boolean,
          %% Indicates that this is Onezone's panel.
          serviceType => {equal, <<"onezone">>},
          %% The domain of this Onezone cluster. Null before cluster is
          %% configured.
          zoneDomain => string,
          %% The name of this Onezone cluster. Null before cluster is configured.
          zoneName => {string, optional}
      }.
  
  
negative.code: -spec op_configuration_model() -> maps:map().
  op_configuration_model() ->
      #{
          %% The Id of cluster record for this cluster. `null` if the
          %% cluster is not registered.
          clusterId => string,
          %% Version of this Onepanel
          version => string,
  